Finding the Fourth Proportional to 1,395.12, 1,922.22 and 928.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.12 : 1,922.22 = 928.56 : x
2. Step 2: Convert to fraction form
   1,395.12/1,922.22 = 928.56/x
3. Step 3: Cross multiply
   1,395.12x = 1,922.22 × 928.56
4. Step 4: Simplify right side
   1,395.12x = 1,784,896.60
5. Step 5: Solve for x
   x = 1,784,896.60/1,395.12
6. Step 6: Final answer
   x = 1,279.39