Finding the Fourth Proportional to 3,951.72, 5,449.86 and 2,553

Step by Step Solution

1. Step 1: Write the proportion equation
   3,951.72 : 5,449.86 = 2,553 : x
2. Step 2: Convert to fraction form
   3,951.72/5,449.86 = 2,553/x
3. Step 3: Cross multiply
   3,951.72x = 5,449.86 × 2,553
4. Step 4: Simplify right side
   3,951.72x = 13,913,492.58
5. Step 5: Solve for x
   x = 13,913,492.58/3,951.72
6. Step 6: Final answer
   x = 3,520.87