Finding the Third Proportional to 216,589.50 and 336,665.25

Step by Step Solution

1. Step 1: Write the proportion equation
   216,589.50 : 336,665.25 = 336,665.25 : x
2. Step 2: Convert to fraction form
   216,589.50/336,665.25 = 336,665.25/x
3. Step 3: Cross multiply
   216,589.50x = 336,665.25 × 336,665.25
4. Step 4: Simplify right side
   216,589.50x = 113,343,490,557.56
5. Step 5: Solve for x
   x = 113,343,490,557.56/216,589.50
6. Step 6: Final answer
   x = 523,310.18