Finding the Fourth Proportional to 1,192.59, 1,645.79 and 668.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.59 : 1,645.79 = 668.79 : x
2. Step 2: Convert to fraction form
   1,192.59/1,645.79 = 668.79/x
3. Step 3: Cross multiply
   1,192.59x = 1,645.79 × 668.79
4. Step 4: Simplify right side
   1,192.59x = 1,100,687.89
5. Step 5: Solve for x
   x = 1,100,687.89/1,192.59
6. Step 6: Final answer
   x = 922.94