Finding the Fourth Proportional to 2,145.56, 3,218.83 and 913.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.56 : 3,218.83 = 913.37 : x
2. Step 2: Convert to fraction form
   2,145.56/3,218.83 = 913.37/x
3. Step 3: Cross multiply
   2,145.56x = 3,218.83 × 913.37
4. Step 4: Simplify right side
   2,145.56x = 2,939,964.38
5. Step 5: Solve for x
   x = 2,939,964.38/2,145.56
6. Step 6: Final answer
   x = 1,370.26