Finding the Fourth Proportional to 9,111.89, 12,577.32 and 5,919.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.89 : 12,577.32 = 5,919.57 : x
2. Step 2: Convert to fraction form
   9,111.89/12,577.32 = 5,919.57/x
3. Step 3: Cross multiply
   9,111.89x = 12,577.32 × 5,919.57
4. Step 4: Simplify right side
   9,111.89x = 74,452,326.15
5. Step 5: Solve for x
   x = 74,452,326.15/9,111.89
6. Step 6: Final answer
   x = 8,170.90