Finding the Fourth Proportional to 1,111.72, 1,533.84 and 669.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.72 : 1,533.84 = 669.52 : x
2. Step 2: Convert to fraction form
   1,111.72/1,533.84 = 669.52/x
3. Step 3: Cross multiply
   1,111.72x = 1,533.84 × 669.52
4. Step 4: Simplify right side
   1,111.72x = 1,026,936.56
5. Step 5: Solve for x
   x = 1,026,936.56/1,111.72
6. Step 6: Final answer
   x = 923.74