Finding the Fourth Proportional to 2,669.63, 4,003.90 and 721.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.63 : 4,003.90 = 721.38 : x
2. Step 2: Convert to fraction form
   2,669.63/4,003.90 = 721.38/x
3. Step 3: Cross multiply
   2,669.63x = 4,003.90 × 721.38
4. Step 4: Simplify right side
   2,669.63x = 2,888,333.38
5. Step 5: Solve for x
   x = 2,888,333.38/2,669.63
6. Step 6: Final answer
   x = 1,081.92