Finding the Fourth Proportional to 2,663.84, 3,993.24 and 931.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.84 : 3,993.24 = 931.34 : x
2. Step 2: Convert to fraction form
   2,663.84/3,993.24 = 931.34/x
3. Step 3: Cross multiply
   2,663.84x = 3,993.24 × 931.34
4. Step 4: Simplify right side
   2,663.84x = 3,719,064.14
5. Step 5: Solve for x
   x = 3,719,064.14/2,663.84
6. Step 6: Final answer
   x = 1,396.13