Finding the Fourth Proportional to 1,200.59, 1,656.78 and 669.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.59 : 1,656.78 = 669.46 : x
2. Step 2: Convert to fraction form
   1,200.59/1,656.78 = 669.46/x
3. Step 3: Cross multiply
   1,200.59x = 1,656.78 × 669.46
4. Step 4: Simplify right side
   1,200.59x = 1,109,147.94
5. Step 5: Solve for x
   x = 1,109,147.94/1,200.59
6. Step 6: Final answer
   x = 923.84