Finding the Fourth Proportional to 8,785.89, 13,169.72 and 5,491.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.89 : 13,169.72 = 5,491.42 : x
2. Step 2: Convert to fraction form
   8,785.89/13,169.72 = 5,491.42/x
3. Step 3: Cross multiply
   8,785.89x = 13,169.72 × 5,491.42
4. Step 4: Simplify right side
   8,785.89x = 72,320,444.61
5. Step 5: Solve for x
   x = 72,320,444.61/8,785.89
6. Step 6: Final answer
   x = 8,231.43