Finding the Fourth Proportional to 8,839.78, 13,268.89 and 3,912.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,839.78 : 13,268.89 = 3,912.88 : x
2. Step 2: Convert to fraction form
   8,839.78/13,268.89 = 3,912.88/x
3. Step 3: Cross multiply
   8,839.78x = 13,268.89 × 3,912.88
4. Step 4: Simplify right side
   8,839.78x = 51,919,564.52
5. Step 5: Solve for x
   x = 51,919,564.52/8,839.78
6. Step 6: Final answer
   x = 5,873.40