Finding the Third Proportional to 13,688 and 17,820

Step by Step Solution

1. Step 1: Write the proportion equation
   13,688 : 17,820 = 17,820 : x
2. Step 2: Convert to fraction form
   13,688/17,820 = 17,820/x
3. Step 3: Cross multiply
   13,688x = 17,820 × 17,820
4. Step 4: Simplify right side
   13,688x = 317,552,400
5. Step 5: Solve for x
   x = 317,552,400/13,688
6. Step 6: Final answer
   x = 23,199.33