Finding the Third Proportional to 399,103.50 and 857,256

Step by Step Solution

1. Step 1: Write the proportion equation
   399,103.50 : 857,256 = 857,256 : x
2. Step 2: Convert to fraction form
   399,103.50/857,256 = 857,256/x
3. Step 3: Cross multiply
   399,103.50x = 857,256 × 857,256
4. Step 4: Simplify right side
   399,103.50x = 734,887,849,536
5. Step 5: Solve for x
   x = 734,887,849,536/399,103.50
6. Step 6: Final answer
   x = 1,841,346.54