Finding the Fourth Proportional to 2,261.83, 3,390.42 and 1,285.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.83 : 3,390.42 = 1,285.87 : x
2. Step 2: Convert to fraction form
   2,261.83/3,390.42 = 1,285.87/x
3. Step 3: Cross multiply
   2,261.83x = 3,390.42 × 1,285.87
4. Step 4: Simplify right side
   2,261.83x = 4,359,639.37
5. Step 5: Solve for x
   x = 4,359,639.37/2,261.83
6. Step 6: Final answer
   x = 1,927.48