Finding the Fourth Proportional to 91,371.83, 136,725.59 and 75,428.60

Step by Step Solution

1. Step 1: Write the proportion equation
   91,371.83 : 136,725.59 = 75,428.60 : x
2. Step 2: Convert to fraction form
   91,371.83/136,725.59 = 75,428.60/x
3. Step 3: Cross multiply
   91,371.83x = 136,725.59 × 75,428.60
4. Step 4: Simplify right side
   91,371.83x = 10,313,018,777.10
5. Step 5: Solve for x
   x = 10,313,018,777.10/91,371.83
6. Step 6: Final answer
   x = 112,868.70