Finding the Fourth Proportional to 99,131, 136,799.16 and 56,688.08

Step by Step Solution

1. Step 1: Write the proportion equation
   99,131 : 136,799.16 = 56,688.08 : x
2. Step 2: Convert to fraction form
   99,131/136,799.16 = 56,688.08/x
3. Step 3: Cross multiply
   99,131x = 136,799.16 × 56,688.08
4. Step 4: Simplify right side
   99,131x = 7,754,881,726.01
5. Step 5: Solve for x
   x = 7,754,881,726.01/99,131
6. Step 6: Final answer
   x = 78,228.62