Finding the Fourth Proportional to 11,855.47, 17,766.15 and 8,710.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,855.47 : 17,766.15 = 8,710.78 : x
2. Step 2: Convert to fraction form
   11,855.47/17,766.15 = 8,710.78/x
3. Step 3: Cross multiply
   11,855.47x = 17,766.15 × 8,710.78
4. Step 4: Simplify right side
   11,855.47x = 154,757,024.10
5. Step 5: Solve for x
   x = 154,757,024.10/11,855.47
6. Step 6: Final answer
   x = 13,053.64