Finding the Third Proportional to 129,919.50 and 279,180

Step by Step Solution

1. Step 1: Write the proportion equation
   129,919.50 : 279,180 = 279,180 : x
2. Step 2: Convert to fraction form
   129,919.50/279,180 = 279,180/x
3. Step 3: Cross multiply
   129,919.50x = 279,180 × 279,180
4. Step 4: Simplify right side
   129,919.50x = 77,941,472,400
5. Step 5: Solve for x
   x = 77,941,472,400/129,919.50
6. Step 6: Final answer
   x = 599,921.28