Finding the Fourth Proportional to 1,228.09, 1,694.71 and 668.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.09 : 1,694.71 = 668.52 : x
2. Step 2: Convert to fraction form
   1,228.09/1,694.71 = 668.52/x
3. Step 3: Cross multiply
   1,228.09x = 1,694.71 × 668.52
4. Step 4: Simplify right side
   1,228.09x = 1,132,947.53
5. Step 5: Solve for x
   x = 1,132,947.53/1,228.09
6. Step 6: Final answer
   x = 922.53