Finding the Fourth Proportional to 91,710.10, 128,131.70 and 91,710.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,710.10 : 128,131.70 = 91,710.10 : x
2. Step 2: Convert to fraction form
   91,710.10/128,131.70 = 91,710.10/x
3. Step 3: Cross multiply
   91,710.10x = 128,131.70 × 91,710.10
4. Step 4: Simplify right side
   91,710.10x = 11,750,971,020.17
5. Step 5: Solve for x
   x = 11,750,971,020.17/91,710.10
6. Step 6: Final answer
   x = 128,131.70