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Finding the Fourth Proportional to 81,045.60, 121,515.60 and 72,751.20

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Solution

The fourth proportional to 81,045.60, 121,515.60 and 72,751.20 is: 109,079.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,045.60 : 121,515.60 = 72,751.20 : x
  2. Step 2: Convert to fraction form
    81,045.60/121,515.60 = 72,751.20/x
  3. Step 3: Cross multiply
    81,045.60x = 121,515.60 × 72,751.20
  4. Step 4: Simplify right side
    81,045.60x = 8,840,405,718.72
  5. Step 5: Solve for x
    x = 8,840,405,718.72/81,045.60
  6. Step 6: Final answer
    x = 109,079.40

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