Finding the Fourth Proportional to 2,386.28, 3,578.34 and 742.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.28 : 3,578.34 = 742.34 : x
2. Step 2: Convert to fraction form
   2,386.28/3,578.34 = 742.34/x
3. Step 3: Cross multiply
   2,386.28x = 3,578.34 × 742.34
4. Step 4: Simplify right side
   2,386.28x = 2,656,344.92
5. Step 5: Solve for x
   x = 2,656,344.92/2,386.28
6. Step 6: Final answer
   x = 1,113.17