Finding the Third Proportional to 399,006 and 864,472.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,006 : 864,472.50 = 864,472.50 : x
2. Step 2: Convert to fraction form
   399,006/864,472.50 = 864,472.50/x
3. Step 3: Cross multiply
   399,006x = 864,472.50 × 864,472.50
4. Step 4: Simplify right side
   399,006x = 747,312,703,256.25
5. Step 5: Solve for x
   x = 747,312,703,256.25/399,006
6. Step 6: Final answer
   x = 1,872,936.00