Finding the Fourth Proportional to 128,650.72, 177,535.92 and 72,061.92

Step by Step Solution

1. Step 1: Write the proportion equation
   128,650.72 : 177,535.92 = 72,061.92 : x
2. Step 2: Convert to fraction form
   128,650.72/177,535.92 = 72,061.92/x
3. Step 3: Cross multiply
   128,650.72x = 177,535.92 × 72,061.92
4. Step 4: Simplify right side
   128,650.72x = 12,793,579,264.17
5. Step 5: Solve for x
   x = 12,793,579,264.17/128,650.72
6. Step 6: Final answer
   x = 99,444.29