Finding the Third Proportional to 7,950 and 12,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,950 : 12,139.50 = 12,139.50 : x
2. Step 2: Convert to fraction form
   7,950/12,139.50 = 12,139.50/x
3. Step 3: Cross multiply
   7,950x = 12,139.50 × 12,139.50
4. Step 4: Simplify right side
   7,950x = 147,367,460.25
5. Step 5: Solve for x
   x = 147,367,460.25/7,950
6. Step 6: Final answer
   x = 18,536.79