Finding the Third Proportional to 21,516 and 31,290

Step by Step Solution

1. Step 1: Write the proportion equation
   21,516 : 31,290 = 31,290 : x
2. Step 2: Convert to fraction form
   21,516/31,290 = 31,290/x
3. Step 3: Cross multiply
   21,516x = 31,290 × 31,290
4. Step 4: Simplify right side
   21,516x = 979,064,100
5. Step 5: Solve for x
   x = 979,064,100/21,516
6. Step 6: Final answer
   x = 45,504.00