Finding the Fourth Proportional to 8,611.86, 12,939.42 and 5,493.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,611.86 : 12,939.42 = 5,493.30 : x
2. Step 2: Convert to fraction form
   8,611.86/12,939.42 = 5,493.30/x
3. Step 3: Cross multiply
   8,611.86x = 12,939.42 × 5,493.30
4. Step 4: Simplify right side
   8,611.86x = 71,080,115.89
5. Step 5: Solve for x
   x = 71,080,115.89/8,611.86
6. Step 6: Final answer
   x = 8,253.75