Finding the Third Proportional to 13,908 and 21,516

Step by Step Solution

1. Step 1: Write the proportion equation
   13,908 : 21,516 = 21,516 : x
2. Step 2: Convert to fraction form
   13,908/21,516 = 21,516/x
3. Step 3: Cross multiply
   13,908x = 21,516 × 21,516
4. Step 4: Simplify right side
   13,908x = 462,938,256
5. Step 5: Solve for x
   x = 462,938,256/13,908
6. Step 6: Final answer
   x = 33,285.75