Finding the Third Proportional to 399,518.50 and 858,327.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,518.50 : 858,327.50 = 858,327.50 : x
2. Step 2: Convert to fraction form
   399,518.50/858,327.50 = 858,327.50/x
3. Step 3: Cross multiply
   399,518.50x = 858,327.50 × 858,327.50
4. Step 4: Simplify right side
   399,518.50x = 736,726,097,256.25
5. Step 5: Solve for x
   x = 736,726,097,256.25/399,518.50
6. Step 6: Final answer
   x = 1,844,035.00