Finding the Fourth Proportional to 1,111.07, 1,533.37 and 668.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.07 : 1,533.37 = 668.88 : x
2. Step 2: Convert to fraction form
   1,111.07/1,533.37 = 668.88/x
3. Step 3: Cross multiply
   1,111.07x = 1,533.37 × 668.88
4. Step 4: Simplify right side
   1,111.07x = 1,025,643.48
5. Step 5: Solve for x
   x = 1,025,643.48/1,111.07
6. Step 6: Final answer
   x = 923.12