Finding the Fourth Proportional to 3,521.72, 5,272.86 and 2,659.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,521.72 : 5,272.86 = 2,659.88 : x
2. Step 2: Convert to fraction form
   3,521.72/5,272.86 = 2,659.88/x
3. Step 3: Cross multiply
   3,521.72x = 5,272.86 × 2,659.88
4. Step 4: Simplify right side
   3,521.72x = 14,025,174.86
5. Step 5: Solve for x
   x = 14,025,174.86/3,521.72
6. Step 6: Final answer
   x = 3,982.48