Finding the Fourth Proportional to 1,853.37, 2,556.99 and 1,521.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.37 : 2,556.99 = 1,521.72 : x
2. Step 2: Convert to fraction form
   1,853.37/2,556.99 = 1,521.72/x
3. Step 3: Cross multiply
   1,853.37x = 2,556.99 × 1,521.72
4. Step 4: Simplify right side
   1,853.37x = 3,891,022.82
5. Step 5: Solve for x
   x = 3,891,022.82/1,853.37
6. Step 6: Final answer
   x = 2,099.43