Finding the Fourth Proportional to 3,721.10, 5,131.69 and 2,879.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,721.10 : 5,131.69 = 2,879.10 : x
2. Step 2: Convert to fraction form
   3,721.10/5,131.69 = 2,879.10/x
3. Step 3: Cross multiply
   3,721.10x = 5,131.69 × 2,879.10
4. Step 4: Simplify right side
   3,721.10x = 14,774,641.48
5. Step 5: Solve for x
   x = 14,774,641.48/3,721.10
6. Step 6: Final answer
   x = 3,970.51