Finding the Fourth Proportional to 11,981.06, 17,975.16 and 8,656.82

Step by Step Solution

1. Step 1: Write the proportion equation
   11,981.06 : 17,975.16 = 8,656.82 : x
2. Step 2: Convert to fraction form
   11,981.06/17,975.16 = 8,656.82/x
3. Step 3: Cross multiply
   11,981.06x = 17,975.16 × 8,656.82
4. Step 4: Simplify right side
   11,981.06x = 155,607,724.59
5. Step 5: Solve for x
   x = 155,607,724.59/11,981.06
6. Step 6: Final answer
   x = 12,987.81