Finding the Fourth Proportional to 2,820.29, 3,895.72 and 2,165.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.29 : 3,895.72 = 2,165.24 : x
2. Step 2: Convert to fraction form
   2,820.29/3,895.72 = 2,165.24/x
3. Step 3: Cross multiply
   2,820.29x = 3,895.72 × 2,165.24
4. Step 4: Simplify right side
   2,820.29x = 8,435,168.77
5. Step 5: Solve for x
   x = 8,435,168.77/2,820.29
6. Step 6: Final answer
   x = 2,990.89