Finding the Fourth Proportional to 8,906.88, 12,290.72 and 5,550.08

Step by Step Solution

1. Step 1: Write the proportion equation
   8,906.88 : 12,290.72 = 5,550.08 : x
2. Step 2: Convert to fraction form
   8,906.88/12,290.72 = 5,550.08/x
3. Step 3: Cross multiply
   8,906.88x = 12,290.72 × 5,550.08
4. Step 4: Simplify right side
   8,906.88x = 68,214,479.26
5. Step 5: Solve for x
   x = 68,214,479.26/8,906.88
6. Step 6: Final answer
   x = 7,658.63