Finding the Fourth Proportional to 2,398.24, 3,595.92 and 991.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,398.24 : 3,595.92 = 991.57 : x
2. Step 2: Convert to fraction form
   2,398.24/3,595.92 = 991.57/x
3. Step 3: Cross multiply
   2,398.24x = 3,595.92 × 991.57
4. Step 4: Simplify right side
   2,398.24x = 3,565,606.39
5. Step 5: Solve for x
   x = 3,565,606.39/2,398.24
6. Step 6: Final answer
   x = 1,486.76