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Finding the Fourth Proportional to 72,870.99, 109,313.72 and 20,280.47

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Solution

The fourth proportional to 72,870.99, 109,313.72 and 20,280.47 is: 30,422.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,870.99 : 109,313.72 = 20,280.47 : x
  2. Step 2: Convert to fraction form
    72,870.99/109,313.72 = 20,280.47/x
  3. Step 3: Cross multiply
    72,870.99x = 109,313.72 × 20,280.47
  4. Step 4: Simplify right side
    72,870.99x = 2,216,932,971.08
  5. Step 5: Solve for x
    x = 2,216,932,971.08/72,870.99
  6. Step 6: Final answer
    x = 30,422.71

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