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Finding the Fourth Proportional to 13,815.92, 20,720.88 and 3,952.55

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Solution

The fourth proportional to 13,815.92, 20,720.88 and 3,952.55 is: 5,927.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,815.92 : 20,720.88 = 3,952.55 : x
  2. Step 2: Convert to fraction form
    13,815.92/20,720.88 = 3,952.55/x
  3. Step 3: Cross multiply
    13,815.92x = 20,720.88 × 3,952.55
  4. Step 4: Simplify right side
    13,815.92x = 81,900,210.64
  5. Step 5: Solve for x
    x = 81,900,210.64/13,815.92
  6. Step 6: Final answer
    x = 5,927.96

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