Finding the Fourth Proportional to 1,200.42, 1,656.54 and 669.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.42 : 1,656.54 = 669.33 : x
2. Step 2: Convert to fraction form
   1,200.42/1,656.54 = 669.33/x
3. Step 3: Cross multiply
   1,200.42x = 1,656.54 × 669.33
4. Step 4: Simplify right side
   1,200.42x = 1,108,771.92
5. Step 5: Solve for x
   x = 1,108,771.92/1,200.42
6. Step 6: Final answer
   x = 923.65