Finding the Fourth Proportional to 2,386.27, 3,579.42 and 742.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.27 : 3,579.42 = 742.78 : x
2. Step 2: Convert to fraction form
   2,386.27/3,579.42 = 742.78/x
3. Step 3: Cross multiply
   2,386.27x = 3,579.42 × 742.78
4. Step 4: Simplify right side
   2,386.27x = 2,658,703.69
5. Step 5: Solve for x
   x = 2,658,703.69/2,386.27
6. Step 6: Final answer
   x = 1,114.17