Finding the Fourth Proportional to 2,145.39, 3,216.91 and 1,159.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.39 : 3,216.91 = 1,159.38 : x
2. Step 2: Convert to fraction form
   2,145.39/3,216.91 = 1,159.38/x
3. Step 3: Cross multiply
   2,145.39x = 3,216.91 × 1,159.38
4. Step 4: Simplify right side
   2,145.39x = 3,729,621.12
5. Step 5: Solve for x
   x = 3,729,621.12/2,145.39
6. Step 6: Final answer
   x = 1,738.44