Finding the Fourth Proportional to 2,561.54, 3,840.56 and 918.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.54 : 3,840.56 = 918.05 : x
2. Step 2: Convert to fraction form
   2,561.54/3,840.56 = 918.05/x
3. Step 3: Cross multiply
   2,561.54x = 3,840.56 × 918.05
4. Step 4: Simplify right side
   2,561.54x = 3,525,821.52
5. Step 5: Solve for x
   x = 3,525,821.52/2,561.54
6. Step 6: Final answer
   x = 1,376.45