Finding the Third Proportional to 78,717.50 and 169,872.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,717.50 : 169,872.50 = 169,872.50 : x
2. Step 2: Convert to fraction form
   78,717.50/169,872.50 = 169,872.50/x
3. Step 3: Cross multiply
   78,717.50x = 169,872.50 × 169,872.50
4. Step 4: Simplify right side
   78,717.50x = 28,856,666,256.25
5. Step 5: Solve for x
   x = 28,856,666,256.25/78,717.50
6. Step 6: Final answer
   x = 366,585.15