Finding the Fourth Proportional to 1,086.95, 1,626.78 and 822.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.95 : 1,626.78 = 822.69 : x
2. Step 2: Convert to fraction form
   1,086.95/1,626.78 = 822.69/x
3. Step 3: Cross multiply
   1,086.95x = 1,626.78 × 822.69
4. Step 4: Simplify right side
   1,086.95x = 1,338,338.72
5. Step 5: Solve for x
   x = 1,338,338.72/1,086.95
6. Step 6: Final answer
   x = 1,231.28