Finding the Fourth Proportional to 3,858.61, 5,782.78 and 2,103.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858.61 : 5,782.78 = 2,103.61 : x
2. Step 2: Convert to fraction form
   3,858.61/5,782.78 = 2,103.61/x
3. Step 3: Cross multiply
   3,858.61x = 5,782.78 × 2,103.61
4. Step 4: Simplify right side
   3,858.61x = 12,164,713.84
5. Step 5: Solve for x
   x = 12,164,713.84/3,858.61
6. Step 6: Final answer
   x = 3,152.62