Finding the Fourth Proportional to 1,393.46, 1,922.78 and 896.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.46 : 1,922.78 = 896.78 : x
2. Step 2: Convert to fraction form
   1,393.46/1,922.78 = 896.78/x
3. Step 3: Cross multiply
   1,393.46x = 1,922.78 × 896.78
4. Step 4: Simplify right side
   1,393.46x = 1,724,317.70
5. Step 5: Solve for x
   x = 1,724,317.70/1,393.46
6. Step 6: Final answer
   x = 1,237.43