Finding the Fourth Proportional to 1,111.42, 1,533.55 and 669.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.42 : 1,533.55 = 669.35 : x
2. Step 2: Convert to fraction form
   1,111.42/1,533.55 = 669.35/x
3. Step 3: Cross multiply
   1,111.42x = 1,533.55 × 669.35
4. Step 4: Simplify right side
   1,111.42x = 1,026,481.69
5. Step 5: Solve for x
   x = 1,026,481.69/1,111.42
6. Step 6: Final answer
   x = 923.58