Finding the Fourth Proportional to 2,663.19, 3,994.43 and 715.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.19 : 3,994.43 = 715.23 : x
2. Step 2: Convert to fraction form
   2,663.19/3,994.43 = 715.23/x
3. Step 3: Cross multiply
   2,663.19x = 3,994.43 × 715.23
4. Step 4: Simplify right side
   2,663.19x = 2,856,932.59
5. Step 5: Solve for x
   x = 2,856,932.59/2,663.19
6. Step 6: Final answer
   x = 1,072.75