Finding the Fourth Proportional to 12,913.83, 19,378.04 and 5,517.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.83 : 19,378.04 = 5,517.72 : x
2. Step 2: Convert to fraction form
   12,913.83/19,378.04 = 5,517.72/x
3. Step 3: Cross multiply
   12,913.83x = 19,378.04 × 5,517.72
4. Step 4: Simplify right side
   12,913.83x = 106,922,571.28
5. Step 5: Solve for x
   x = 106,922,571.28/12,913.83
6. Step 6: Final answer
   x = 8,279.69