Finding the Third Proportional to 60,120 and 128,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   60,120 : 128,290.50 = 128,290.50 : x
2. Step 2: Convert to fraction form
   60,120/128,290.50 = 128,290.50/x
3. Step 3: Cross multiply
   60,120x = 128,290.50 × 128,290.50
4. Step 4: Simplify right side
   60,120x = 16,458,452,390.25
5. Step 5: Solve for x
   x = 16,458,452,390.25/60,120
6. Step 6: Final answer
   x = 273,760.02