Finding the Third Proportional to 39,990 and 57,600

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990 : 57,600 = 57,600 : x
2. Step 2: Convert to fraction form
   39,990/57,600 = 57,600/x
3. Step 3: Cross multiply
   39,990x = 57,600 × 57,600
4. Step 4: Simplify right side
   39,990x = 3,317,760,000
5. Step 5: Solve for x
   x = 3,317,760,000/39,990
6. Step 6: Final answer
   x = 82,964.74