Finding the Third Proportional to 129,238.50 and 279,234

Step by Step Solution

1. Step 1: Write the proportion equation
   129,238.50 : 279,234 = 279,234 : x
2. Step 2: Convert to fraction form
   129,238.50/279,234 = 279,234/x
3. Step 3: Cross multiply
   129,238.50x = 279,234 × 279,234
4. Step 4: Simplify right side
   129,238.50x = 77,971,626,756
5. Step 5: Solve for x
   x = 77,971,626,756/129,238.50
6. Step 6: Final answer
   x = 603,315.78