Finding the Fourth Proportional to 8,799.20, 12,139.56 and 5,440.94

Step by Step Solution

1. Step 1: Write the proportion equation
   8,799.20 : 12,139.56 = 5,440.94 : x
2. Step 2: Convert to fraction form
   8,799.20/12,139.56 = 5,440.94/x
3. Step 3: Cross multiply
   8,799.20x = 12,139.56 × 5,440.94
4. Step 4: Simplify right side
   8,799.20x = 66,050,556.89
5. Step 5: Solve for x
   x = 66,050,556.89/8,799.20
6. Step 6: Final answer
   x = 7,506.43