Finding the Fourth Proportional to 3,987.55, 5,501.86 and 2,308.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.55 : 5,501.86 = 2,308.92 : x
2. Step 2: Convert to fraction form
   3,987.55/5,501.86 = 2,308.92/x
3. Step 3: Cross multiply
   3,987.55x = 5,501.86 × 2,308.92
4. Step 4: Simplify right side
   3,987.55x = 12,703,354.59
5. Step 5: Solve for x
   x = 12,703,354.59/3,987.55
6. Step 6: Final answer
   x = 3,185.75