Finding the Fourth Proportional to 2,663.14, 3,996.51 and 931.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.14 : 3,996.51 = 931.78 : x
2. Step 2: Convert to fraction form
   2,663.14/3,996.51 = 931.78/x
3. Step 3: Cross multiply
   2,663.14x = 3,996.51 × 931.78
4. Step 4: Simplify right side
   2,663.14x = 3,723,868.09
5. Step 5: Solve for x
   x = 3,723,868.09/2,663.14
6. Step 6: Final answer
   x = 1,398.30