Finding the Fourth Proportional to 5,165.89, 7,128.73 and 2,807.95

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.89 : 7,128.73 = 2,807.95 : x
2. Step 2: Convert to fraction form
   5,165.89/7,128.73 = 2,807.95/x
3. Step 3: Cross multiply
   5,165.89x = 7,128.73 × 2,807.95
4. Step 4: Simplify right side
   5,165.89x = 20,017,117.40
5. Step 5: Solve for x
   x = 20,017,117.40/5,165.89
6. Step 6: Final answer
   x = 3,874.86