Finding the Fourth Proportional to 5,165.47, 7,128.46 and 2,807.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.47 : 7,128.46 = 2,807.76 : x
2. Step 2: Convert to fraction form
   5,165.47/7,128.46 = 2,807.76/x
3. Step 3: Cross multiply
   5,165.47x = 7,128.46 × 2,807.76
4. Step 4: Simplify right side
   5,165.47x = 20,015,019.30
5. Step 5: Solve for x
   x = 20,015,019.30/5,165.47
6. Step 6: Final answer
   x = 3,874.77