Finding the Fourth Proportional to 1,086.80, 1,626.56 and 904.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.80 : 1,626.56 = 904.56 : x
2. Step 2: Convert to fraction form
   1,086.80/1,626.56 = 904.56/x
3. Step 3: Cross multiply
   1,086.80x = 1,626.56 × 904.56
4. Step 4: Simplify right side
   1,086.80x = 1,471,321.11
5. Step 5: Solve for x
   x = 1,471,321.11/1,086.80
6. Step 6: Final answer
   x = 1,353.81