Finding the Fourth Proportional to 2,870.96, 3,956.52 and 2,072.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.96 : 3,956.52 = 2,072.88 : x
2. Step 2: Convert to fraction form
   2,870.96/3,956.52 = 2,072.88/x
3. Step 3: Cross multiply
   2,870.96x = 3,956.52 × 2,072.88
4. Step 4: Simplify right side
   2,870.96x = 8,201,391.18
5. Step 5: Solve for x
   x = 8,201,391.18/2,870.96
6. Step 6: Final answer
   x = 2,856.67