Finding the Fourth Proportional to 2,145.82, 3,218.72 and 758.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.82 : 3,218.72 = 758.82 : x
2. Step 2: Convert to fraction form
   2,145.82/3,218.72 = 758.82/x
3. Step 3: Cross multiply
   2,145.82x = 3,218.72 × 758.82
4. Step 4: Simplify right side
   2,145.82x = 2,442,429.11
5. Step 5: Solve for x
   x = 2,442,429.11/2,145.82
6. Step 6: Final answer
   x = 1,138.23