Finding the Fourth Proportional to 8,611.58, 12,896.86 and 5,981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,611.58 : 12,896.86 = 5,981.72 : x
2. Step 2: Convert to fraction form
   8,611.58/12,896.86 = 5,981.72/x
3. Step 3: Cross multiply
   8,611.58x = 12,896.86 × 5,981.72
4. Step 4: Simplify right side
   8,611.58x = 77,145,405.40
5. Step 5: Solve for x
   x = 77,145,405.40/8,611.58
6. Step 6: Final answer
   x = 8,958.33