Finding the Third Proportional to 129,078.56 and 279,601.88

Step by Step Solution

1. Step 1: Write the proportion equation
   129,078.56 : 279,601.88 = 279,601.88 : x
2. Step 2: Convert to fraction form
   129,078.56/279,601.88 = 279,601.88/x
3. Step 3: Cross multiply
   129,078.56x = 279,601.88 × 279,601.88
4. Step 4: Simplify right side
   129,078.56x = 78,177,208,503.52
5. Step 5: Solve for x
   x = 78,177,208,503.52/129,078.56
6. Step 6: Final answer
   x = 605,656.02