Finding the Fourth Proportional to 3,931.53, 5,422.71 and 3,257.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.53 : 5,422.71 = 3,257.20 : x
2. Step 2: Convert to fraction form
   3,931.53/5,422.71 = 3,257.20/x
3. Step 3: Cross multiply
   3,931.53x = 5,422.71 × 3,257.20
4. Step 4: Simplify right side
   3,931.53x = 17,662,851.01
5. Step 5: Solve for x
   x = 17,662,851.01/3,931.53
6. Step 6: Final answer
   x = 4,492.62