Finding the Fourth Proportional to 2,561.76, 3,843.25 and 918.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.76 : 3,843.25 = 918.68 : x
2. Step 2: Convert to fraction form
   2,561.76/3,843.25 = 918.68/x
3. Step 3: Cross multiply
   2,561.76x = 3,843.25 × 918.68
4. Step 4: Simplify right side
   2,561.76x = 3,530,695.40
5. Step 5: Solve for x
   x = 3,530,695.40/2,561.76
6. Step 6: Final answer
   x = 1,378.23