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Finding the Fourth Proportional to 1,985.62, 2,978.40 and 815.62

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Solution

The fourth proportional to 1,985.62, 2,978.40 and 815.62 is: 1,223.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.62 : 2,978.40 = 815.62 : x
  2. Step 2: Convert to fraction form
    1,985.62/2,978.40 = 815.62/x
  3. Step 3: Cross multiply
    1,985.62x = 2,978.40 × 815.62
  4. Step 4: Simplify right side
    1,985.62x = 2,429,242.61
  5. Step 5: Solve for x
    x = 2,429,242.61/1,985.62
  6. Step 6: Final answer
    x = 1,223.42

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