Finding the Third Proportional to 78,640.88 and 109,957.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,640.88 : 109,957.50 = 109,957.50 : x
2. Step 2: Convert to fraction form
   78,640.88/109,957.50 = 109,957.50/x
3. Step 3: Cross multiply
   78,640.88x = 109,957.50 × 109,957.50
4. Step 4: Simplify right side
   78,640.88x = 12,090,651,806.25
5. Step 5: Solve for x
   x = 12,090,651,806.25/78,640.88
6. Step 6: Final answer
   x = 153,745.13