Finding the Third Proportional to 78,208.50 and 171,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,208.50 : 171,118.50 = 171,118.50 : x
2. Step 2: Convert to fraction form
   78,208.50/171,118.50 = 171,118.50/x
3. Step 3: Cross multiply
   78,208.50x = 171,118.50 × 171,118.50
4. Step 4: Simplify right side
   78,208.50x = 29,281,541,042.25
5. Step 5: Solve for x
   x = 29,281,541,042.25/78,208.50
6. Step 6: Final answer
   x = 374,403.56