Finding the Third Proportional to 12,748 and 13,990

Step by Step Solution

1. Step 1: Write the proportion equation
   12,748 : 13,990 = 13,990 : x
2. Step 2: Convert to fraction form
   12,748/13,990 = 13,990/x
3. Step 3: Cross multiply
   12,748x = 13,990 × 13,990
4. Step 4: Simplify right side
   12,748x = 195,720,100
5. Step 5: Solve for x
   x = 195,720,100/12,748
6. Step 6: Final answer
   x = 15,353.00