Finding the Fourth Proportional to 2,839.89, 4,261.60 and 1,085.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,839.89 : 4,261.60 = 1,085.05 : x
2. Step 2: Convert to fraction form
   2,839.89/4,261.60 = 1,085.05/x
3. Step 3: Cross multiply
   2,839.89x = 4,261.60 × 1,085.05
4. Step 4: Simplify right side
   2,839.89x = 4,624,041.14
5. Step 5: Solve for x
   x = 4,624,041.14/2,839.89
6. Step 6: Final answer
   x = 1,628.25