Finding the Fourth Proportional to 1,111.38, 1,533.49 and 669.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.38 : 1,533.49 = 669.30 : x
2. Step 2: Convert to fraction form
   1,111.38/1,533.49 = 669.30/x
3. Step 3: Cross multiply
   1,111.38x = 1,533.49 × 669.30
4. Step 4: Simplify right side
   1,111.38x = 1,026,364.86
5. Step 5: Solve for x
   x = 1,026,364.86/1,111.38
6. Step 6: Final answer
   x = 923.50