Finding the Third Proportional to 129,974 and 279,290

Step by Step Solution

1. Step 1: Write the proportion equation
   129,974 : 279,290 = 279,290 : x
2. Step 2: Convert to fraction form
   129,974/279,290 = 279,290/x
3. Step 3: Cross multiply
   129,974x = 279,290 × 279,290
4. Step 4: Simplify right side
   129,974x = 78,002,904,100
5. Step 5: Solve for x
   x = 78,002,904,100/129,974
6. Step 6: Final answer
   x = 600,142.37