Finding the Fourth Proportional to 1,418.89, 1,958.10 and 859.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.89 : 1,958.10 = 859.25 : x
2. Step 2: Convert to fraction form
   1,418.89/1,958.10 = 859.25/x
3. Step 3: Cross multiply
   1,418.89x = 1,958.10 × 859.25
4. Step 4: Simplify right side
   1,418.89x = 1,682,487.63
5. Step 5: Solve for x
   x = 1,682,487.63/1,418.89
6. Step 6: Final answer
   x = 1,185.78