Finding the Fourth Proportional to 2,719.80, 4,078.41 and 870.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.80 : 4,078.41 = 870.48 : x
2. Step 2: Convert to fraction form
   2,719.80/4,078.41 = 870.48/x
3. Step 3: Cross multiply
   2,719.80x = 4,078.41 × 870.48
4. Step 4: Simplify right side
   2,719.80x = 3,550,174.34
5. Step 5: Solve for x
   x = 3,550,174.34/2,719.80
6. Step 6: Final answer
   x = 1,305.31