Finding the Fourth Proportional to 1,228.34, 1,694.72 and 704.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.34 : 1,694.72 = 704.28 : x
2. Step 2: Convert to fraction form
   1,228.34/1,694.72 = 704.28/x
3. Step 3: Cross multiply
   1,228.34x = 1,694.72 × 704.28
4. Step 4: Simplify right side
   1,228.34x = 1,193,557.40
5. Step 5: Solve for x
   x = 1,193,557.40/1,228.34
6. Step 6: Final answer
   x = 971.68