Finding the Fourth Proportional to 2,521.20, 3,479.36 and 1,525.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.20 : 3,479.36 = 1,525.91 : x
2. Step 2: Convert to fraction form
   2,521.20/3,479.36 = 1,525.91/x
3. Step 3: Cross multiply
   2,521.20x = 3,479.36 × 1,525.91
4. Step 4: Simplify right side
   2,521.20x = 5,309,194.55
5. Step 5: Solve for x
   x = 5,309,194.55/2,521.20
6. Step 6: Final answer
   x = 2,105.82