Finding the Fourth Proportional to 8,111.87, 12,167.72 and 2,565.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,111.87 : 12,167.72 = 2,565.21 : x
2. Step 2: Convert to fraction form
   8,111.87/12,167.72 = 2,565.21/x
3. Step 3: Cross multiply
   8,111.87x = 12,167.72 × 2,565.21
4. Step 4: Simplify right side
   8,111.87x = 31,212,757.02
5. Step 5: Solve for x
   x = 31,212,757.02/8,111.87
6. Step 6: Final answer
   x = 3,847.79