Finding the Fourth Proportional to 12,860.54, 17,742.32 and 8,382.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,860.54 : 17,742.32 = 8,382.72 : x
2. Step 2: Convert to fraction form
   12,860.54/17,742.32 = 8,382.72/x
3. Step 3: Cross multiply
   12,860.54x = 17,742.32 × 8,382.72
4. Step 4: Simplify right side
   12,860.54x = 148,728,900.71
5. Step 5: Solve for x
   x = 148,728,900.71/12,860.54
6. Step 6: Final answer
   x = 11,564.75