Finding the Fourth Proportional to 3,987.88, 5,969.48 and 3,397.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.88 : 5,969.48 = 3,397.40 : x
2. Step 2: Convert to fraction form
   3,987.88/5,969.48 = 3,397.40/x
3. Step 3: Cross multiply
   3,987.88x = 5,969.48 × 3,397.40
4. Step 4: Simplify right side
   3,987.88x = 20,280,711.35
5. Step 5: Solve for x
   x = 20,280,711.35/3,987.88
6. Step 6: Final answer
   x = 5,085.59