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Finding the Fourth Proportional to 663,621.60, 915,771.43 and 391,777.06

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Solution

The fourth proportional to 663,621.60, 915,771.43 and 391,777.06 is: 540,636.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,621.60 : 915,771.43 = 391,777.06 : x
  2. Step 2: Convert to fraction form
    663,621.60/915,771.43 = 391,777.06/x
  3. Step 3: Cross multiply
    663,621.60x = 915,771.43 × 391,777.06
  4. Step 4: Simplify right side
    663,621.60x = 358,778,240,766.82
  5. Step 5: Solve for x
    x = 358,778,240,766.82/663,621.60
  6. Step 6: Final answer
    x = 540,636.78

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