Finding the Fourth Proportional to 2,561.47, 3,843.06 and 918.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.47 : 3,843.06 = 918.49 : x
2. Step 2: Convert to fraction form
   2,561.47/3,843.06 = 918.49/x
3. Step 3: Cross multiply
   2,561.47x = 3,843.06 × 918.49
4. Step 4: Simplify right side
   2,561.47x = 3,529,812.18
5. Step 5: Solve for x
   x = 3,529,812.18/2,561.47
6. Step 6: Final answer
   x = 1,378.04