Finding the Third Proportional to 13,188 and 20,486

Step by Step Solution

1. Step 1: Write the proportion equation
   13,188 : 20,486 = 20,486 : x
2. Step 2: Convert to fraction form
   13,188/20,486 = 20,486/x
3. Step 3: Cross multiply
   13,188x = 20,486 × 20,486
4. Step 4: Simplify right side
   13,188x = 419,676,196
5. Step 5: Solve for x
   x = 419,676,196/13,188
6. Step 6: Final answer
   x = 31,822.58