Finding the Fourth Proportional to 3,987.33, 5,978.98 and 2,321.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.33 : 5,978.98 = 2,321.99 : x
2. Step 2: Convert to fraction form
   3,987.33/5,978.98 = 2,321.99/x
3. Step 3: Cross multiply
   3,987.33x = 5,978.98 × 2,321.99
4. Step 4: Simplify right side
   3,987.33x = 13,883,138.41
5. Step 5: Solve for x
   x = 13,883,138.41/3,987.33
6. Step 6: Final answer
   x = 3,481.81