Finding the Fourth Proportional to 2,078.28, 3,116.31 and 617.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.28 : 3,116.31 = 617.22 : x
2. Step 2: Convert to fraction form
   2,078.28/3,116.31 = 617.22/x
3. Step 3: Cross multiply
   2,078.28x = 3,116.31 × 617.22
4. Step 4: Simplify right side
   2,078.28x = 1,923,448.86
5. Step 5: Solve for x
   x = 1,923,448.86/2,078.28
6. Step 6: Final answer
   x = 925.50