Finding the Fourth Proportional to 1,354.72, 2,031.82 and 660.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.72 : 2,031.82 = 660.69 : x
2. Step 2: Convert to fraction form
   1,354.72/2,031.82 = 660.69/x
3. Step 3: Cross multiply
   1,354.72x = 2,031.82 × 660.69
4. Step 4: Simplify right side
   1,354.72x = 1,342,403.16
5. Step 5: Solve for x
   x = 1,342,403.16/1,354.72
6. Step 6: Final answer
   x = 990.91