Finding the Fourth Proportional to 2,870.48, 4,305.78 and 922.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.48 : 4,305.78 = 922.28 : x
2. Step 2: Convert to fraction form
   2,870.48/4,305.78 = 922.28/x
3. Step 3: Cross multiply
   2,870.48x = 4,305.78 × 922.28
4. Step 4: Simplify right side
   2,870.48x = 3,971,134.78
5. Step 5: Solve for x
   x = 3,971,134.78/2,870.48
6. Step 6: Final answer
   x = 1,383.44