Finding the Fourth Proportional to 3,856.90, 5,780.83 and 3,393.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.90 : 5,780.83 = 3,393.72 : x
2. Step 2: Convert to fraction form
   3,856.90/5,780.83 = 3,393.72/x
3. Step 3: Cross multiply
   3,856.90x = 5,780.83 × 3,393.72
4. Step 4: Simplify right side
   3,856.90x = 19,618,518.39
5. Step 5: Solve for x
   x = 19,618,518.39/3,856.90
6. Step 6: Final answer
   x = 5,086.60