Finding the Third Proportional to 399,700.50 and 856,380

Step by Step Solution

1. Step 1: Write the proportion equation
   399,700.50 : 856,380 = 856,380 : x
2. Step 2: Convert to fraction form
   399,700.50/856,380 = 856,380/x
3. Step 3: Cross multiply
   399,700.50x = 856,380 × 856,380
4. Step 4: Simplify right side
   399,700.50x = 733,386,704,400
5. Step 5: Solve for x
   x = 733,386,704,400/399,700.50
6. Step 6: Final answer
   x = 1,834,840.60