Finding the Fourth Proportional to 2,870.96, 3,960.60 and 2,031.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.96 : 3,960.60 = 2,031.68 : x
2. Step 2: Convert to fraction form
   2,870.96/3,960.60 = 2,031.68/x
3. Step 3: Cross multiply
   2,870.96x = 3,960.60 × 2,031.68
4. Step 4: Simplify right side
   2,870.96x = 8,046,671.81
5. Step 5: Solve for x
   x = 8,046,671.81/2,870.96
6. Step 6: Final answer
   x = 2,802.78