Finding the Fourth Proportional to 91,152.49, 136,531.90 and 88,921.75

Step by Step Solution

1. Step 1: Write the proportion equation
   91,152.49 : 136,531.90 = 88,921.75 : x
2. Step 2: Convert to fraction form
   91,152.49/136,531.90 = 88,921.75/x
3. Step 3: Cross multiply
   91,152.49x = 136,531.90 × 88,921.75
4. Step 4: Simplify right side
   91,152.49x = 12,140,655,478.83
5. Step 5: Solve for x
   x = 12,140,655,478.83/91,152.49
6. Step 6: Final answer
   x = 133,190.61