Finding the Fourth Proportional to 1,111.48, 1,533.80 and 669.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.48 : 1,533.80 = 669.43 : x
2. Step 2: Convert to fraction form
   1,111.48/1,533.80 = 669.43/x
3. Step 3: Cross multiply
   1,111.48x = 1,533.80 × 669.43
4. Step 4: Simplify right side
   1,111.48x = 1,026,760.72
5. Step 5: Solve for x
   x = 1,026,760.72/1,111.48
6. Step 6: Final answer
   x = 923.78