Finding the Fourth Proportional to 3,918.46, 5,405.59 and 2,261.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918.46 : 5,405.59 = 2,261.50 : x
2. Step 2: Convert to fraction form
   3,918.46/5,405.59 = 2,261.50/x
3. Step 3: Cross multiply
   3,918.46x = 5,405.59 × 2,261.50
4. Step 4: Simplify right side
   3,918.46x = 12,224,741.79
5. Step 5: Solve for x
   x = 12,224,741.79/3,918.46
6. Step 6: Final answer
   x = 3,119.78