Finding the Third Proportional to 129,750.61 and 278,900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,750.61 : 278,900.72 = 278,900.72 : x
2. Step 2: Convert to fraction form
   129,750.61/278,900.72 = 278,900.72/x
3. Step 3: Cross multiply
   129,750.61x = 278,900.72 × 278,900.72
4. Step 4: Simplify right side
   129,750.61x = 77,785,610,919.27
5. Step 5: Solve for x
   x = 77,785,610,919.27/129,750.61
6. Step 6: Final answer
   x = 599,500.93