Finding the Third Proportional to 129,123 and 279,686.25

Step by Step Solution

1. Step 1: Write the proportion equation
   129,123 : 279,686.25 = 279,686.25 : x
2. Step 2: Convert to fraction form
   129,123/279,686.25 = 279,686.25/x
3. Step 3: Cross multiply
   129,123x = 279,686.25 × 279,686.25
4. Step 4: Simplify right side
   129,123x = 78,224,398,439.06
5. Step 5: Solve for x
   x = 78,224,398,439.06/129,123
6. Step 6: Final answer
   x = 605,813.05