Finding the Fourth Proportional to 2,663.81, 3,992.81 and 1,019.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.81 : 3,992.81 = 1,019.64 : x
2. Step 2: Convert to fraction form
   2,663.81/3,992.81 = 1,019.64/x
3. Step 3: Cross multiply
   2,663.81x = 3,992.81 × 1,019.64
4. Step 4: Simplify right side
   2,663.81x = 4,071,244.40
5. Step 5: Solve for x
   x = 4,071,244.40/2,663.81
6. Step 6: Final answer
   x = 1,528.35