Finding the Fourth Proportional to 5,165.17, 7,127.89 and 2,807.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.17 : 7,127.89 = 2,807.31 : x
2. Step 2: Convert to fraction form
   5,165.17/7,127.89 = 2,807.31/x
3. Step 3: Cross multiply
   5,165.17x = 7,127.89 × 2,807.31
4. Step 4: Simplify right side
   5,165.17x = 20,010,196.88
5. Step 5: Solve for x
   x = 20,010,196.88/5,165.17
6. Step 6: Final answer
   x = 3,874.06