Finding the Fourth Proportional to 2,591.31, 3,574.80 and 1,528.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.31 : 3,574.80 = 1,528.35 : x
2. Step 2: Convert to fraction form
   2,591.31/3,574.80 = 1,528.35/x
3. Step 3: Cross multiply
   2,591.31x = 3,574.80 × 1,528.35
4. Step 4: Simplify right side
   2,591.31x = 5,463,545.58
5. Step 5: Solve for x
   x = 5,463,545.58/2,591.31
6. Step 6: Final answer
   x = 2,108.41