Finding the Fourth Proportional to 3,987.86, 5,503.42 and 3,323.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.86 : 5,503.42 = 3,323.60 : x
2. Step 2: Convert to fraction form
   3,987.86/5,503.42 = 3,323.60/x
3. Step 3: Cross multiply
   3,987.86x = 5,503.42 × 3,323.60
4. Step 4: Simplify right side
   3,987.86x = 18,291,130.89
5. Step 5: Solve for x
   x = 18,291,130.89/3,987.86
6. Step 6: Final answer
   x = 4,586.71