Finding the Fourth Proportional to 2,870.96, 4,302.60 and 1,311.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.96 : 4,302.60 = 1,311.12 : x
2. Step 2: Convert to fraction form
   2,870.96/4,302.60 = 1,311.12/x
3. Step 3: Cross multiply
   2,870.96x = 4,302.60 × 1,311.12
4. Step 4: Simplify right side
   2,870.96x = 5,641,224.91
5. Step 5: Solve for x
   x = 5,641,224.91/2,870.96
6. Step 6: Final answer
   x = 1,964.93