Finding the Third Proportional to 13,290 and 21,151

Step by Step Solution

1. Step 1: Write the proportion equation
   13,290 : 21,151 = 21,151 : x
2. Step 2: Convert to fraction form
   13,290/21,151 = 21,151/x
3. Step 3: Cross multiply
   13,290x = 21,151 × 21,151
4. Step 4: Simplify right side
   13,290x = 447,364,801
5. Step 5: Solve for x
   x = 447,364,801/13,290
6. Step 6: Final answer
   x = 33,661.76