Finding the Third Proportional to 172,969.50 and 379,991.25

Step by Step Solution

1. Step 1: Write the proportion equation
   172,969.50 : 379,991.25 = 379,991.25 : x
2. Step 2: Convert to fraction form
   172,969.50/379,991.25 = 379,991.25/x
3. Step 3: Cross multiply
   172,969.50x = 379,991.25 × 379,991.25
4. Step 4: Simplify right side
   172,969.50x = 144,393,350,076.56
5. Step 5: Solve for x
   x = 144,393,350,076.56/172,969.50
6. Step 6: Final answer
   x = 834,790.82