Finding the Third Proportional to 138,132.50 and 213,300.75

Step by Step Solution

1. Step 1: Write the proportion equation
   138,132.50 : 213,300.75 = 213,300.75 : x
2. Step 2: Convert to fraction form
   138,132.50/213,300.75 = 213,300.75/x
3. Step 3: Cross multiply
   138,132.50x = 213,300.75 × 213,300.75
4. Step 4: Simplify right side
   138,132.50x = 45,497,209,950.56
5. Step 5: Solve for x
   x = 45,497,209,950.56/138,132.50
6. Step 6: Final answer
   x = 329,373.68