Finding the Fourth Proportional to 8,828.89, 12,178.77 and 5,290.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,828.89 : 12,178.77 = 5,290.04 : x
2. Step 2: Convert to fraction form
   8,828.89/12,178.77 = 5,290.04/x
3. Step 3: Cross multiply
   8,828.89x = 12,178.77 × 5,290.04
4. Step 4: Simplify right side
   8,828.89x = 64,426,191.06
5. Step 5: Solve for x
   x = 64,426,191.06/8,828.89
6. Step 6: Final answer
   x = 7,297.20