Finding the Fourth Proportional to 3,870.96, 5,335.86 and 3,240.36

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.96 : 5,335.86 = 3,240.36 : x
2. Step 2: Convert to fraction form
   3,870.96/5,335.86 = 3,240.36/x
3. Step 3: Cross multiply
   3,870.96x = 5,335.86 × 3,240.36
4. Step 4: Simplify right side
   3,870.96x = 17,290,107.31
5. Step 5: Solve for x
   x = 17,290,107.31/3,870.96
6. Step 6: Final answer
   x = 4,466.62