Finding the Third Proportional to 399,518 and 858,326.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,518 : 858,326.50 = 858,326.50 : x
2. Step 2: Convert to fraction form
   399,518/858,326.50 = 858,326.50/x
3. Step 3: Cross multiply
   399,518x = 858,326.50 × 858,326.50
4. Step 4: Simplify right side
   399,518x = 736,724,380,602.25
5. Step 5: Solve for x
   x = 736,724,380,602.25/399,518
6. Step 6: Final answer
   x = 1,844,033.01