Finding the Third Proportional to 399,521 and 858,332.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,521 : 858,332.50 = 858,332.50 : x
2. Step 2: Convert to fraction form
   399,521/858,332.50 = 858,332.50/x
3. Step 3: Cross multiply
   399,521x = 858,332.50 × 858,332.50
4. Step 4: Simplify right side
   399,521x = 736,734,680,556.25
5. Step 5: Solve for x
   x = 736,734,680,556.25/399,521
6. Step 6: Final answer
   x = 1,844,044.95