Finding the Fourth Proportional to 42,308.72, 63,456.88 and 11,143.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,308.72 : 63,456.88 = 11,143.92 : x
2. Step 2: Convert to fraction form
   42,308.72/63,456.88 = 11,143.92/x
3. Step 3: Cross multiply
   42,308.72x = 63,456.88 × 11,143.92
4. Step 4: Simplify right side
   42,308.72x = 707,158,394.17
5. Step 5: Solve for x
   x = 707,158,394.17/42,308.72
6. Step 6: Final answer
   x = 16,714.25