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Finding the Fourth Proportional to 139,623.20, 209,434.80 and 80,574.20

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Solution

The fourth proportional to 139,623.20, 209,434.80 and 80,574.20 is: 120,861.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,623.20 : 209,434.80 = 80,574.20 : x
  2. Step 2: Convert to fraction form
    139,623.20/209,434.80 = 80,574.20/x
  3. Step 3: Cross multiply
    139,623.20x = 209,434.80 × 80,574.20
  4. Step 4: Simplify right side
    139,623.20x = 16,875,041,462.16
  5. Step 5: Solve for x
    x = 16,875,041,462.16/139,623.20
  6. Step 6: Final answer
    x = 120,861.30

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