Finding the Fourth Proportional to 2,603.82, 3,905.77 and 872.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.82 : 3,905.77 = 872.45 : x
2. Step 2: Convert to fraction form
   2,603.82/3,905.77 = 872.45/x
3. Step 3: Cross multiply
   2,603.82x = 3,905.77 × 872.45
4. Step 4: Simplify right side
   2,603.82x = 3,407,589.04
5. Step 5: Solve for x
   x = 3,407,589.04/2,603.82
6. Step 6: Final answer
   x = 1,308.69