Finding the Third Proportional to 11,686.78 and 17,718.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,686.78 : 17,718.12 = 17,718.12 : x
2. Step 2: Convert to fraction form
   11,686.78/17,718.12 = 17,718.12/x
3. Step 3: Cross multiply
   11,686.78x = 17,718.12 × 17,718.12
4. Step 4: Simplify right side
   11,686.78x = 313,931,676.67
5. Step 5: Solve for x
   x = 313,931,676.67/11,686.78
6. Step 6: Final answer
   x = 26,862.12