Finding the Fourth Proportional to 1,111.25, 1,533.60 and 669.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.25 : 1,533.60 = 669.31 : x
2. Step 2: Convert to fraction form
   1,111.25/1,533.60 = 669.31/x
3. Step 3: Cross multiply
   1,111.25x = 1,533.60 × 669.31
4. Step 4: Simplify right side
   1,111.25x = 1,026,449.98
5. Step 5: Solve for x
   x = 1,026,449.98/1,111.25
6. Step 6: Final answer
   x = 923.69