Finding the Fourth Proportional to 2,390.40, 3,586.62 and 1,158.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.40 : 3,586.62 = 1,158.72 : x
2. Step 2: Convert to fraction form
   2,390.40/3,586.62 = 1,158.72/x
3. Step 3: Cross multiply
   2,390.40x = 3,586.62 × 1,158.72
4. Step 4: Simplify right side
   2,390.40x = 4,155,888.33
5. Step 5: Solve for x
   x = 4,155,888.33/2,390.40
6. Step 6: Final answer
   x = 1,738.57