Finding the Third Proportional to 400,087.50 and 868,861.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,087.50 : 868,861.50 = 868,861.50 : x
2. Step 2: Convert to fraction form
   400,087.50/868,861.50 = 868,861.50/x
3. Step 3: Cross multiply
   400,087.50x = 868,861.50 × 868,861.50
4. Step 4: Simplify right side
   400,087.50x = 754,920,306,182.25
5. Step 5: Solve for x
   x = 754,920,306,182.25/400,087.50
6. Step 6: Final answer
   x = 1,886,888.01