Finding the Third Proportional to 399,516 and 858,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,516 : 858,322.50 = 858,322.50 : x
2. Step 2: Convert to fraction form
   399,516/858,322.50 = 858,322.50/x
3. Step 3: Cross multiply
   399,516x = 858,322.50 × 858,322.50
4. Step 4: Simplify right side
   399,516x = 736,717,514,006.25
5. Step 5: Solve for x
   x = 736,717,514,006.25/399,516
6. Step 6: Final answer
   x = 1,844,025.06