Finding the Fourth Proportional to 2,615.78, 3,922.70 and 1,055.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.78 : 3,922.70 = 1,055.36 : x
2. Step 2: Convert to fraction form
   2,615.78/3,922.70 = 1,055.36/x
3. Step 3: Cross multiply
   2,615.78x = 3,922.70 × 1,055.36
4. Step 4: Simplify right side
   2,615.78x = 4,139,865.20
5. Step 5: Solve for x
   x = 4,139,865.20/2,615.78
6. Step 6: Final answer
   x = 1,582.65