Finding the Third Proportional to 133,991.50 and 213,287

Step by Step Solution

1. Step 1: Write the proportion equation
   133,991.50 : 213,287 = 213,287 : x
2. Step 2: Convert to fraction form
   133,991.50/213,287 = 213,287/x
3. Step 3: Cross multiply
   133,991.50x = 213,287 × 213,287
4. Step 4: Simplify right side
   133,991.50x = 45,491,344,369
5. Step 5: Solve for x
   x = 45,491,344,369/133,991.50
6. Step 6: Final answer
   x = 339,509.18