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Finding the Fourth Proportional to 72,985.60, 100,720.08 and 39,451.60

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Solution

The fourth proportional to 72,985.60, 100,720.08 and 39,451.60 is: 54,443.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,985.60 : 100,720.08 = 39,451.60 : x
  2. Step 2: Convert to fraction form
    72,985.60/100,720.08 = 39,451.60/x
  3. Step 3: Cross multiply
    72,985.60x = 100,720.08 × 39,451.60
  4. Step 4: Simplify right side
    72,985.60x = 3,973,568,056.33
  5. Step 5: Solve for x
    x = 3,973,568,056.33/72,985.60
  6. Step 6: Final answer
    x = 54,443.18

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