Finding the Fourth Proportional to 3,931.58, 5,425.82 and 2,253.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.58 : 5,425.82 = 2,253.20 : x
2. Step 2: Convert to fraction form
   3,931.58/5,425.82 = 2,253.20/x
3. Step 3: Cross multiply
   3,931.58x = 5,425.82 × 2,253.20
4. Step 4: Simplify right side
   3,931.58x = 12,225,419.23
5. Step 5: Solve for x
   x = 12,225,419.23/3,931.58
6. Step 6: Final answer
   x = 3,109.55