Finding the Fourth Proportional to 9,111.75, 13,660.29 and 3,921.27

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.75 : 13,660.29 = 3,921.27 : x
2. Step 2: Convert to fraction form
   9,111.75/13,660.29 = 3,921.27/x
3. Step 3: Cross multiply
   9,111.75x = 13,660.29 × 3,921.27
4. Step 4: Simplify right side
   9,111.75x = 53,565,685.37
5. Step 5: Solve for x
   x = 53,565,685.37/9,111.75
6. Step 6: Final answer
   x = 5,878.75