Finding the Fourth Proportional to 2,586.96, 3,890.52 and 2,100.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,586.96 : 3,890.52 = 2,100.96 : x
2. Step 2: Convert to fraction form
   2,586.96/3,890.52 = 2,100.96/x
3. Step 3: Cross multiply
   2,586.96x = 3,890.52 × 2,100.96
4. Step 4: Simplify right side
   2,586.96x = 8,173,826.90
5. Step 5: Solve for x
   x = 8,173,826.90/2,586.96
6. Step 6: Final answer
   x = 3,159.63