Finding the Fourth Proportional to 1,418.48, 1,957.55 and 859.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.48 : 1,957.55 = 859.05 : x
2. Step 2: Convert to fraction form
   1,418.48/1,957.55 = 859.05/x
3. Step 3: Cross multiply
   1,418.48x = 1,957.55 × 859.05
4. Step 4: Simplify right side
   1,418.48x = 1,681,629.03
5. Step 5: Solve for x
   x = 1,681,629.03/1,418.48
6. Step 6: Final answer
   x = 1,185.51