Finding the Fourth Proportional to 91,748.30, 128,535.10 and 91,748.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91,748.30 : 128,535.10 = 91,748.30 : x
2. Step 2: Convert to fraction form
   91,748.30/128,535.10 = 91,748.30/x
3. Step 3: Cross multiply
   91,748.30x = 128,535.10 × 91,748.30
4. Step 4: Simplify right side
   91,748.30x = 11,792,876,915.33
5. Step 5: Solve for x
   x = 11,792,876,915.33/91,748.30
6. Step 6: Final answer
   x = 128,535.10