Finding the Third Proportional to 21,510 and 31,900

Step by Step Solution

1. Step 1: Write the proportion equation
   21,510 : 31,900 = 31,900 : x
2. Step 2: Convert to fraction form
   21,510/31,900 = 31,900/x
3. Step 3: Cross multiply
   21,510x = 31,900 × 31,900
4. Step 4: Simplify right side
   21,510x = 1,017,610,000
5. Step 5: Solve for x
   x = 1,017,610,000/21,510
6. Step 6: Final answer
   x = 47,308.69