Finding the Fourth Proportional to 9,111.85, 12,574.61 and 8,781.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.85 : 12,574.61 = 8,781.37 : x
2. Step 2: Convert to fraction form
   9,111.85/12,574.61 = 8,781.37/x
3. Step 3: Cross multiply
   9,111.85x = 12,574.61 × 8,781.37
4. Step 4: Simplify right side
   9,111.85x = 110,422,260.60
5. Step 5: Solve for x
   x = 110,422,260.60/9,111.85
6. Step 6: Final answer
   x = 12,118.54