Finding the Third Proportional to 68,604.75 and 91,057.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,604.75 : 91,057.50 = 91,057.50 : x
2. Step 2: Convert to fraction form
   68,604.75/91,057.50 = 91,057.50/x
3. Step 3: Cross multiply
   68,604.75x = 91,057.50 × 91,057.50
4. Step 4: Simplify right side
   68,604.75x = 8,291,468,306.25
5. Step 5: Solve for x
   x = 8,291,468,306.25/68,604.75
6. Step 6: Final answer
   x = 120,858.52