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Finding the Fourth Proportional to 39,861.60, 59,799.60 and 20,090.40

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Solution

The fourth proportional to 39,861.60, 59,799.60 and 20,090.40 is: 30,139.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,861.60 : 59,799.60 = 20,090.40 : x
  2. Step 2: Convert to fraction form
    39,861.60/59,799.60 = 20,090.40/x
  3. Step 3: Cross multiply
    39,861.60x = 59,799.60 × 20,090.40
  4. Step 4: Simplify right side
    39,861.60x = 1,201,397,883.84
  5. Step 5: Solve for x
    x = 1,201,397,883.84/39,861.60
  6. Step 6: Final answer
    x = 30,139.23

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