Finding the Fourth Proportional to 42,732.31, 64,104.54 and 13,152.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,732.31 : 64,104.54 = 13,152.61 : x
2. Step 2: Convert to fraction form
   42,732.31/64,104.54 = 13,152.61/x
3. Step 3: Cross multiply
   42,732.31x = 64,104.54 × 13,152.61
4. Step 4: Simplify right side
   42,732.31x = 843,142,013.85
5. Step 5: Solve for x
   x = 843,142,013.85/42,732.31
6. Step 6: Final answer
   x = 19,730.78