Finding the Fourth Proportional to 1,165.56, 1,608.33 and 661.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.56 : 1,608.33 = 661.43 : x
2. Step 2: Convert to fraction form
   1,165.56/1,608.33 = 661.43/x
3. Step 3: Cross multiply
   1,165.56x = 1,608.33 × 661.43
4. Step 4: Simplify right side
   1,165.56x = 1,063,789.67
5. Step 5: Solve for x
   x = 1,063,789.67/1,165.56
6. Step 6: Final answer
   x = 912.69