Finding the Fourth Proportional to 2,560.58, 3,840.45 and 916.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.58 : 3,840.45 = 916.82 : x
2. Step 2: Convert to fraction form
   2,560.58/3,840.45 = 916.82/x
3. Step 3: Cross multiply
   2,560.58x = 3,840.45 × 916.82
4. Step 4: Simplify right side
   2,560.58x = 3,521,001.37
5. Step 5: Solve for x
   x = 3,521,001.37/2,560.58
6. Step 6: Final answer
   x = 1,375.08