Finding the Fourth Proportional to 8,919.89, 12,309.54 and 5,382.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,919.89 : 12,309.54 = 5,382.42 : x
2. Step 2: Convert to fraction form
   8,919.89/12,309.54 = 5,382.42/x
3. Step 3: Cross multiply
   8,919.89x = 12,309.54 × 5,382.42
4. Step 4: Simplify right side
   8,919.89x = 66,255,117.18
5. Step 5: Solve for x
   x = 66,255,117.18/8,919.89
6. Step 6: Final answer
   x = 7,427.79