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Finding the Fourth Proportional to 30,590.80, 42,215.79 and 16,978.48

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Solution

The fourth proportional to 30,590.80, 42,215.79 and 16,978.48 is: 23,430.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,590.80 : 42,215.79 = 16,978.48 : x
  2. Step 2: Convert to fraction form
    30,590.80/42,215.79 = 16,978.48/x
  3. Step 3: Cross multiply
    30,590.80x = 42,215.79 × 16,978.48
  4. Step 4: Simplify right side
    30,590.80x = 716,759,946.20
  5. Step 5: Solve for x
    x = 716,759,946.20/30,590.80
  6. Step 6: Final answer
    x = 23,430.57

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