Finding the Fourth Proportional to 2,561.75, 3,843.01 and 917.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.75 : 3,843.01 = 917.91 : x
2. Step 2: Convert to fraction form
   2,561.75/3,843.01 = 917.91/x
3. Step 3: Cross multiply
   2,561.75x = 3,843.01 × 917.91
4. Step 4: Simplify right side
   2,561.75x = 3,527,518.09
5. Step 5: Solve for x
   x = 3,527,518.09/2,561.75
6. Step 6: Final answer
   x = 1,377.00