Finding the Fourth Proportional to 91,454.30, 128,123.50 and 91,454.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91,454.30 : 128,123.50 = 91,454.30 : x
2. Step 2: Convert to fraction form
   91,454.30/128,123.50 = 91,454.30/x
3. Step 3: Cross multiply
   91,454.30x = 128,123.50 × 91,454.30
4. Step 4: Simplify right side
   91,454.30x = 11,717,445,006.05
5. Step 5: Solve for x
   x = 11,717,445,006.05/91,454.30
6. Step 6: Final answer
   x = 128,123.50