Finding the Fourth Proportional to 1,111.01, 1,533.21 and 668.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.01 : 1,533.21 = 668.89 : x
2. Step 2: Convert to fraction form
   1,111.01/1,533.21 = 668.89/x
3. Step 3: Cross multiply
   1,111.01x = 1,533.21 × 668.89
4. Step 4: Simplify right side
   1,111.01x = 1,025,541.17
5. Step 5: Solve for x
   x = 1,025,541.17/1,111.01
6. Step 6: Final answer
   x = 923.07