Finding the Fourth Proportional to 8,919.30, 13,382.69 and 3,919.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.30 : 13,382.69 = 3,919.10 : x
2. Step 2: Convert to fraction form
   8,919.30/13,382.69 = 3,919.10/x
3. Step 3: Cross multiply
   8,919.30x = 13,382.69 × 3,919.10
4. Step 4: Simplify right side
   8,919.30x = 52,448,013.87
5. Step 5: Solve for x
   x = 52,448,013.87/8,919.30
6. Step 6: Final answer
   x = 5,880.28