Finding the Third Proportional to 399,685.50 and 856,350

Step by Step Solution

1. Step 1: Write the proportion equation
   399,685.50 : 856,350 = 856,350 : x
2. Step 2: Convert to fraction form
   399,685.50/856,350 = 856,350/x
3. Step 3: Cross multiply
   399,685.50x = 856,350 × 856,350
4. Step 4: Simplify right side
   399,685.50x = 733,335,322,500
5. Step 5: Solve for x
   x = 733,335,322,500/399,685.50
6. Step 6: Final answer
   x = 1,834,780.90