Finding the Fourth Proportional to 2,719.40, 4,077.83 and 870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.40 : 4,077.83 = 870.10 : x
2. Step 2: Convert to fraction form
   2,719.40/4,077.83 = 870.10/x
3. Step 3: Cross multiply
   2,719.40x = 4,077.83 × 870.10
4. Step 4: Simplify right side
   2,719.40x = 3,548,111.86
5. Step 5: Solve for x
   x = 3,548,111.86/2,719.40
6. Step 6: Final answer
   x = 1,304.74