Finding the Third Proportional to 138,517.50 and 303,309

Step by Step Solution

1. Step 1: Write the proportion equation
   138,517.50 : 303,309 = 303,309 : x
2. Step 2: Convert to fraction form
   138,517.50/303,309 = 303,309/x
3. Step 3: Cross multiply
   138,517.50x = 303,309 × 303,309
4. Step 4: Simplify right side
   138,517.50x = 91,996,349,481
5. Step 5: Solve for x
   x = 91,996,349,481/138,517.50
6. Step 6: Final answer
   x = 664,149.65