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Finding the Fourth Proportional to 30,961.57, 42,744.68 and 20,381.96

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Solution

The fourth proportional to 30,961.57, 42,744.68 and 20,381.96 is: 28,138.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,961.57 : 42,744.68 = 20,381.96 : x
  2. Step 2: Convert to fraction form
    30,961.57/42,744.68 = 20,381.96/x
  3. Step 3: Cross multiply
    30,961.57x = 42,744.68 × 20,381.96
  4. Step 4: Simplify right side
    30,961.57x = 871,220,042.34
  5. Step 5: Solve for x
    x = 871,220,042.34/30,961.57
  6. Step 6: Final answer
    x = 28,138.76

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