Finding the Fourth Proportional to 1,356.61, 1,871.38 and 936.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.61 : 1,871.38 = 936.22 : x
2. Step 2: Convert to fraction form
   1,356.61/1,871.38 = 936.22/x
3. Step 3: Cross multiply
   1,356.61x = 1,871.38 × 936.22
4. Step 4: Simplify right side
   1,356.61x = 1,752,023.38
5. Step 5: Solve for x
   x = 1,752,023.38/1,356.61
6. Step 6: Final answer
   x = 1,291.47