Finding the Fourth Proportional to 11,851.47, 17,760.15 and 8,706.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,851.47 : 17,760.15 = 8,706.78 : x
2. Step 2: Convert to fraction form
   11,851.47/17,760.15 = 8,706.78/x
3. Step 3: Cross multiply
   11,851.47x = 17,760.15 × 8,706.78
4. Step 4: Simplify right side
   11,851.47x = 154,633,718.82
5. Step 5: Solve for x
   x = 154,633,718.82/11,851.47
6. Step 6: Final answer
   x = 13,047.64