Finding the Third Proportional to 83,121.75 and 172,156.50

Step by Step Solution

1. Step 1: Write the proportion equation
   83,121.75 : 172,156.50 = 172,156.50 : x
2. Step 2: Convert to fraction form
   83,121.75/172,156.50 = 172,156.50/x
3. Step 3: Cross multiply
   83,121.75x = 172,156.50 × 172,156.50
4. Step 4: Simplify right side
   83,121.75x = 29,637,860,492.25
5. Step 5: Solve for x
   x = 29,637,860,492.25/83,121.75
6. Step 6: Final answer
   x = 356,559.63