Finding the Fourth Proportional to 1,111.06, 1,533.39 and 668.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.06 : 1,533.39 = 668.94 : x
2. Step 2: Convert to fraction form
   1,111.06/1,533.39 = 668.94/x
3. Step 3: Cross multiply
   1,111.06x = 1,533.39 × 668.94
4. Step 4: Simplify right side
   1,111.06x = 1,025,745.91
5. Step 5: Solve for x
   x = 1,025,745.91/1,111.06
6. Step 6: Final answer
   x = 923.21