Finding the Fourth Proportional to 5,165.79, 7,128.76 and 2,807.93

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.79 : 7,128.76 = 2,807.93 : x
2. Step 2: Convert to fraction form
   5,165.79/7,128.76 = 2,807.93/x
3. Step 3: Cross multiply
   5,165.79x = 7,128.76 × 2,807.93
4. Step 4: Simplify right side
   5,165.79x = 20,017,075.13
5. Step 5: Solve for x
   x = 20,017,075.13/5,165.79
6. Step 6: Final answer
   x = 3,874.93