Finding the Fourth Proportional to 2,603.76, 3,906.72 and 872.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.76 : 3,906.72 = 872.52 : x
2. Step 2: Convert to fraction form
   2,603.76/3,906.72 = 872.52/x
3. Step 3: Cross multiply
   2,603.76x = 3,906.72 × 872.52
4. Step 4: Simplify right side
   2,603.76x = 3,408,691.33
5. Step 5: Solve for x
   x = 3,408,691.33/2,603.76
6. Step 6: Final answer
   x = 1,309.14