Finding the Third Proportional to 21,516 and 31,640

Step by Step Solution

1. Step 1: Write the proportion equation
   21,516 : 31,640 = 31,640 : x
2. Step 2: Convert to fraction form
   21,516/31,640 = 31,640/x
3. Step 3: Cross multiply
   21,516x = 31,640 × 31,640
4. Step 4: Simplify right side
   21,516x = 1,001,089,600
5. Step 5: Solve for x
   x = 1,001,089,600/21,516
6. Step 6: Final answer
   x = 46,527.68