Finding the Fourth Proportional to 5,160.54, 7,121.61 and 2,802.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,160.54 : 7,121.61 = 2,802.72 : x
2. Step 2: Convert to fraction form
   5,160.54/7,121.61 = 2,802.72/x
3. Step 3: Cross multiply
   5,160.54x = 7,121.61 × 2,802.72
4. Step 4: Simplify right side
   5,160.54x = 19,959,878.78
5. Step 5: Solve for x
   x = 19,959,878.78/5,160.54
6. Step 6: Final answer
   x = 3,867.79