Finding the Third Proportional to 31,800 and 48,900

Step by Step Solution

1. Step 1: Write the proportion equation
   31,800 : 48,900 = 48,900 : x
2. Step 2: Convert to fraction form
   31,800/48,900 = 48,900/x
3. Step 3: Cross multiply
   31,800x = 48,900 × 48,900
4. Step 4: Simplify right side
   31,800x = 2,391,210,000
5. Step 5: Solve for x
   x = 2,391,210,000/31,800
6. Step 6: Final answer
   x = 75,195.28