Finding the Third Proportional to 399,347.50 and 868,665.25

Step by Step Solution

1. Step 1: Write the proportion equation
   399,347.50 : 868,665.25 = 868,665.25 : x
2. Step 2: Convert to fraction form
   399,347.50/868,665.25 = 868,665.25/x
3. Step 3: Cross multiply
   399,347.50x = 868,665.25 × 868,665.25
4. Step 4: Simplify right side
   399,347.50x = 754,579,316,557.56
5. Step 5: Solve for x
   x = 754,579,316,557.56/399,347.50
6. Step 6: Final answer
   x = 1,889,530.59