Finding the Fourth Proportional to 1,200.51, 1,656.61 and 669.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.51 : 1,656.61 = 669.35 : x
2. Step 2: Convert to fraction form
   1,200.51/1,656.61 = 669.35/x
3. Step 3: Cross multiply
   1,200.51x = 1,656.61 × 669.35
4. Step 4: Simplify right side
   1,200.51x = 1,108,851.90
5. Step 5: Solve for x
   x = 1,108,851.90/1,200.51
6. Step 6: Final answer
   x = 923.65