Finding the Fourth Proportional to 5,156.72, 7,116.16 and 2,798.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,156.72 : 7,116.16 = 2,798.80 : x
2. Step 2: Convert to fraction form
   5,156.72/7,116.16 = 2,798.80/x
3. Step 3: Cross multiply
   5,156.72x = 7,116.16 × 2,798.80
4. Step 4: Simplify right side
   5,156.72x = 19,916,708.61
5. Step 5: Solve for x
   x = 19,916,708.61/5,156.72
6. Step 6: Final answer
   x = 3,862.28