Finding the Fourth Proportional to 2,388.36, 3,581.86 and 927.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.36 : 3,581.86 = 927.20 : x
2. Step 2: Convert to fraction form
   2,388.36/3,581.86 = 927.20/x
3. Step 3: Cross multiply
   2,388.36x = 3,581.86 × 927.20
4. Step 4: Simplify right side
   2,388.36x = 3,321,100.59
5. Step 5: Solve for x
   x = 3,321,100.59/2,388.36
6. Step 6: Final answer
   x = 1,390.54