Finding the Fourth Proportional to 91,701.30, 128,469.30 and 91,701.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91,701.30 : 128,469.30 = 91,701.30 : x
2. Step 2: Convert to fraction form
   91,701.30/128,469.30 = 91,701.30/x
3. Step 3: Cross multiply
   91,701.30x = 128,469.30 × 91,701.30
4. Step 4: Simplify right side
   91,701.30x = 11,780,801,820.09
5. Step 5: Solve for x
   x = 11,780,801,820.09/91,701.30
6. Step 6: Final answer
   x = 128,469.30