Finding the Fourth Proportional to 2,560.89, 3,841.38 and 917.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,560.89 : 3,841.38 = 917.85 : x
2. Step 2: Convert to fraction form
   2,560.89/3,841.38 = 917.85/x
3. Step 3: Cross multiply
   2,560.89x = 3,841.38 × 917.85
4. Step 4: Simplify right side
   2,560.89x = 3,525,810.63
5. Step 5: Solve for x
   x = 3,525,810.63/2,560.89
6. Step 6: Final answer
   x = 1,376.79