Finding the Fourth Proportional to 3,987.46, 5,501.86 and 2,308.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.46 : 5,501.86 = 2,308.78 : x
2. Step 2: Convert to fraction form
   3,987.46/5,501.86 = 2,308.78/x
3. Step 3: Cross multiply
   3,987.46x = 5,501.86 × 2,308.78
4. Step 4: Simplify right side
   3,987.46x = 12,702,584.33
5. Step 5: Solve for x
   x = 12,702,584.33/3,987.46
6. Step 6: Final answer
   x = 3,185.63