Finding the Fourth Proportional to 1,111.08, 1,533.15 and 669.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.08 : 1,533.15 = 669.60 : x
2. Step 2: Convert to fraction form
   1,111.08/1,533.15 = 669.60/x
3. Step 3: Cross multiply
   1,111.08x = 1,533.15 × 669.60
4. Step 4: Simplify right side
   1,111.08x = 1,026,597.24
5. Step 5: Solve for x
   x = 1,026,597.24/1,111.08
6. Step 6: Final answer
   x = 923.96