Finding the Fourth Proportional to 99,061.14, 136,544.55 and 81,124.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,061.14 : 136,544.55 = 81,124.50 : x
2. Step 2: Convert to fraction form
   99,061.14/136,544.55 = 81,124.50/x
3. Step 3: Cross multiply
   99,061.14x = 136,544.55 × 81,124.50
4. Step 4: Simplify right side
   99,061.14x = 11,077,108,346.48
5. Step 5: Solve for x
   x = 11,077,108,346.48/99,061.14
6. Step 6: Final answer
   x = 111,820.93