Finding the Fourth Proportional to 2,663.28, 3,994.38 and 715.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.28 : 3,994.38 = 715.32 : x
2. Step 2: Convert to fraction form
   2,663.28/3,994.38 = 715.32/x
3. Step 3: Cross multiply
   2,663.28x = 3,994.38 × 715.32
4. Step 4: Simplify right side
   2,663.28x = 2,857,259.90
5. Step 5: Solve for x
   x = 2,857,259.90/2,663.28
6. Step 6: Final answer
   x = 1,072.83