Finding the Third Proportional to 129,157.25 and 278,105.25

Step by Step Solution

1. Step 1: Write the proportion equation
   129,157.25 : 278,105.25 = 278,105.25 : x
2. Step 2: Convert to fraction form
   129,157.25/278,105.25 = 278,105.25/x
3. Step 3: Cross multiply
   129,157.25x = 278,105.25 × 278,105.25
4. Step 4: Simplify right side
   129,157.25x = 77,342,530,077.56
5. Step 5: Solve for x
   x = 77,342,530,077.56/129,157.25
6. Step 6: Final answer
   x = 598,824.53