Finding the Fourth Proportional to 12,919.72, 19,381.61 and 5,524.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,919.72 : 19,381.61 = 5,524.22 : x
2. Step 2: Convert to fraction form
   12,919.72/19,381.61 = 5,524.22/x
3. Step 3: Cross multiply
   12,919.72x = 19,381.61 × 5,524.22
4. Step 4: Simplify right side
   12,919.72x = 107,068,277.59
5. Step 5: Solve for x
   x = 107,068,277.59/12,919.72
6. Step 6: Final answer
   x = 8,287.20