Finding the Fourth Proportional to 2,190.40, 3,286.56 and 1,150.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.40 : 3,286.56 = 1,150.15 : x
2. Step 2: Convert to fraction form
   2,190.40/3,286.56 = 1,150.15/x
3. Step 3: Cross multiply
   2,190.40x = 3,286.56 × 1,150.15
4. Step 4: Simplify right side
   2,190.40x = 3,780,036.98
5. Step 5: Solve for x
   x = 3,780,036.98/2,190.40
6. Step 6: Final answer
   x = 1,725.73