Finding the Fourth Proportional to 2,663.72, 3,995.58 and 931.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.72 : 3,995.58 = 931.94 : x
2. Step 2: Convert to fraction form
   2,663.72/3,995.58 = 931.94/x
3. Step 3: Cross multiply
   2,663.72x = 3,995.58 × 931.94
4. Step 4: Simplify right side
   2,663.72x = 3,723,620.85
5. Step 5: Solve for x
   x = 3,723,620.85/2,663.72
6. Step 6: Final answer
   x = 1,397.91