Finding the Third Proportional to 252,572.50 and 399,865

Step by Step Solution

1. Step 1: Write the proportion equation
   252,572.50 : 399,865 = 399,865 : x
2. Step 2: Convert to fraction form
   252,572.50/399,865 = 399,865/x
3. Step 3: Cross multiply
   252,572.50x = 399,865 × 399,865
4. Step 4: Simplify right side
   252,572.50x = 159,892,018,225
5. Step 5: Solve for x
   x = 159,892,018,225/252,572.50
6. Step 6: Final answer
   x = 633,053.95