Finding the Fourth Proportional to 12,789.84, 17,642.90 and 10,647.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.84 : 17,642.90 = 10,647.18 : x
2. Step 2: Convert to fraction form
   12,789.84/17,642.90 = 10,647.18/x
3. Step 3: Cross multiply
   12,789.84x = 17,642.90 × 10,647.18
4. Step 4: Simplify right side
   12,789.84x = 187,847,132.02
5. Step 5: Solve for x
   x = 187,847,132.02/12,789.84
6. Step 6: Final answer
   x = 14,687.22