Finding the Fourth Proportional to 2,521.09, 3,478.20 and 1,578.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.09 : 3,478.20 = 1,578.06 : x
2. Step 2: Convert to fraction form
   2,521.09/3,478.20 = 1,578.06/x
3. Step 3: Cross multiply
   2,521.09x = 3,478.20 × 1,578.06
4. Step 4: Simplify right side
   2,521.09x = 5,488,803.69
5. Step 5: Solve for x
   x = 5,488,803.69/2,521.09
6. Step 6: Final answer
   x = 2,177.16