Finding the Third Proportional to 402,999 and 598,861.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,999 : 598,861.50 = 598,861.50 : x
2. Step 2: Convert to fraction form
   402,999/598,861.50 = 598,861.50/x
3. Step 3: Cross multiply
   402,999x = 598,861.50 × 598,861.50
4. Step 4: Simplify right side
   402,999x = 358,635,096,182.25
5. Step 5: Solve for x
   x = 358,635,096,182.25/402,999
6. Step 6: Final answer
   x = 889,915.60