Finding the Fourth Proportional to 2,560.61, 3,841.22 and 916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.61 : 3,841.22 = 916.72 : x
2. Step 2: Convert to fraction form
   2,560.61/3,841.22 = 916.72/x
3. Step 3: Cross multiply
   2,560.61x = 3,841.22 × 916.72
4. Step 4: Simplify right side
   2,560.61x = 3,521,315.89
5. Step 5: Solve for x
   x = 3,521,315.89/2,560.61
6. Step 6: Final answer
   x = 1,375.18