Finding the Fourth Proportional to 1,101.41, 1,648.56 and 842.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.41 : 1,648.56 = 842.39 : x
2. Step 2: Convert to fraction form
   1,101.41/1,648.56 = 842.39/x
3. Step 3: Cross multiply
   1,101.41x = 1,648.56 × 842.39
4. Step 4: Simplify right side
   1,101.41x = 1,388,730.46
5. Step 5: Solve for x
   x = 1,388,730.46/1,101.41
6. Step 6: Final answer
   x = 1,260.87