Finding the Fourth Proportional to 5,165.16, 7,128.06 and 2,807.46

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.16 : 7,128.06 = 2,807.46 : x
2. Step 2: Convert to fraction form
   5,165.16/7,128.06 = 2,807.46/x
3. Step 3: Cross multiply
   5,165.16x = 7,128.06 × 2,807.46
4. Step 4: Simplify right side
   5,165.16x = 20,011,743.33
5. Step 5: Solve for x
   x = 20,011,743.33/5,165.16
6. Step 6: Final answer
   x = 3,874.37