Finding the Fourth Proportional to 91,704.10, 128,123.30 and 91,704.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,704.10 : 128,123.30 = 91,704.10 : x
2. Step 2: Convert to fraction form
   91,704.10/128,123.30 = 91,704.10/x
3. Step 3: Cross multiply
   91,704.10x = 128,123.30 × 91,704.10
4. Step 4: Simplify right side
   91,704.10x = 11,749,431,915.53
5. Step 5: Solve for x
   x = 11,749,431,915.53/91,704.10
6. Step 6: Final answer
   x = 128,123.30