Finding the Fourth Proportional to 2,663.74, 3,996.42 and 931.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.74 : 3,996.42 = 931.96 : x
2. Step 2: Convert to fraction form
   2,663.74/3,996.42 = 931.96/x
3. Step 3: Cross multiply
   2,663.74x = 3,996.42 × 931.96
4. Step 4: Simplify right side
   2,663.74x = 3,724,503.58
5. Step 5: Solve for x
   x = 3,724,503.58/2,663.74
6. Step 6: Final answer
   x = 1,398.22