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Finding the Fourth Proportional to 212,872,783.60, 318,711,978.60 and 206,900,815.60

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Solution

The fourth proportional to 212,872,783.60, 318,711,978.60 and 206,900,815.60 is: 309,770,780.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,872,783.60 : 318,711,978.60 = 206,900,815.60 : x
  2. Step 2: Convert to fraction form
    212,872,783.60/318,711,978.60 = 206,900,815.60/x
  3. Step 3: Cross multiply
    212,872,783.60x = 318,711,978.60 × 206,900,815.60
  4. Step 4: Simplify right side
    212,872,783.60x = 65,941,768,313,829,752
  5. Step 5: Solve for x
    x = 65,941,768,313,829,752/212,872,783.60
  6. Step 6: Final answer
    x = 309,770,780.46

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