Finding the Third Proportional to 399,348 and 868,666.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,348 : 868,666.50 = 868,666.50 : x
2. Step 2: Convert to fraction form
   399,348/868,666.50 = 868,666.50/x
3. Step 3: Cross multiply
   399,348x = 868,666.50 × 868,666.50
4. Step 4: Simplify right side
   399,348x = 754,581,488,222.25
5. Step 5: Solve for x
   x = 754,581,488,222.25/399,348
6. Step 6: Final answer
   x = 1,889,533.66