Finding the Fourth Proportional to 1,198.45, 1,653.76 and 667.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,198.45 : 1,653.76 = 667.31 : x
2. Step 2: Convert to fraction form
   1,198.45/1,653.76 = 667.31/x
3. Step 3: Cross multiply
   1,198.45x = 1,653.76 × 667.31
4. Step 4: Simplify right side
   1,198.45x = 1,103,570.59
5. Step 5: Solve for x
   x = 1,103,570.59/1,198.45
6. Step 6: Final answer
   x = 920.83