Finding the Fourth Proportional to 3,856.94, 5,779.83 and 2,100.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.94 : 5,779.83 = 2,100.46 : x
2. Step 2: Convert to fraction form
   3,856.94/5,779.83 = 2,100.46/x
3. Step 3: Cross multiply
   3,856.94x = 5,779.83 × 2,100.46
4. Step 4: Simplify right side
   3,856.94x = 12,140,301.72
5. Step 5: Solve for x
   x = 12,140,301.72/3,856.94
6. Step 6: Final answer
   x = 3,147.65