Finding the Third Proportional to 399,109.50 and 857,268

Step by Step Solution

1. Step 1: Write the proportion equation
   399,109.50 : 857,268 = 857,268 : x
2. Step 2: Convert to fraction form
   399,109.50/857,268 = 857,268/x
3. Step 3: Cross multiply
   399,109.50x = 857,268 × 857,268
4. Step 4: Simplify right side
   399,109.50x = 734,908,423,824
5. Step 5: Solve for x
   x = 734,908,423,824/399,109.50
6. Step 6: Final answer
   x = 1,841,370.41