Finding the Fourth Proportional to 2,669.42, 4,003.58 and 721.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.42 : 4,003.58 = 721.17 : x
2. Step 2: Convert to fraction form
   2,669.42/4,003.58 = 721.17/x
3. Step 3: Cross multiply
   2,669.42x = 4,003.58 × 721.17
4. Step 4: Simplify right side
   2,669.42x = 2,887,263.59
5. Step 5: Solve for x
   x = 2,887,263.59/2,669.42
6. Step 6: Final answer
   x = 1,081.61