Finding the Fourth Proportional to 2,856.72, 4,280.76 and 2,122.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.72 : 4,280.76 = 2,122.76 : x
2. Step 2: Convert to fraction form
   2,856.72/4,280.76 = 2,122.76/x
3. Step 3: Cross multiply
   2,856.72x = 4,280.76 × 2,122.76
4. Step 4: Simplify right side
   2,856.72x = 9,087,026.10
5. Step 5: Solve for x
   x = 9,087,026.10/2,856.72
6. Step 6: Final answer
   x = 3,180.93