Finding the Third Proportional to 172,046.85 and 378,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   172,046.85 : 378,128.88 = 378,128.88 : x
2. Step 2: Convert to fraction form
   172,046.85/378,128.88 = 378,128.88/x
3. Step 3: Cross multiply
   172,046.85x = 378,128.88 × 378,128.88
4. Step 4: Simplify right side
   172,046.85x = 142,981,452,017.03
5. Step 5: Solve for x
   x = 142,981,452,017.03/172,046.85
6. Step 6: Final answer
   x = 831,061.16