Finding the Third Proportional to 66,981.50 and 91,217.75

Step by Step Solution

1. Step 1: Write the proportion equation
   66,981.50 : 91,217.75 = 91,217.75 : x
2. Step 2: Convert to fraction form
   66,981.50/91,217.75 = 91,217.75/x
3. Step 3: Cross multiply
   66,981.50x = 91,217.75 × 91,217.75
4. Step 4: Simplify right side
   66,981.50x = 8,320,677,915.06
5. Step 5: Solve for x
   x = 8,320,677,915.06/66,981.50
6. Step 6: Final answer
   x = 124,223.52