Finding the Fourth Proportional to 8,977.36, 12,390.24 and 5,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,977.36 : 12,390.24 = 5,440.72 : x
2. Step 2: Convert to fraction form
   8,977.36/12,390.24 = 5,440.72/x
3. Step 3: Cross multiply
   8,977.36x = 12,390.24 × 5,440.72
4. Step 4: Simplify right side
   8,977.36x = 67,411,826.57
5. Step 5: Solve for x
   x = 67,411,826.57/8,977.36
6. Step 6: Final answer
   x = 7,509.09