Finding the Third Proportional to 239,755.50 and 399,536

Step by Step Solution

1. Step 1: Write the proportion equation
   239,755.50 : 399,536 = 399,536 : x
2. Step 2: Convert to fraction form
   239,755.50/399,536 = 399,536/x
3. Step 3: Cross multiply
   239,755.50x = 399,536 × 399,536
4. Step 4: Simplify right side
   239,755.50x = 159,629,015,296
5. Step 5: Solve for x
   x = 159,629,015,296/239,755.50
6. Step 6: Final answer
   x = 665,799.18