Finding the Fourth Proportional to 1,418.92, 1,958.15 and 859.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.92 : 1,958.15 = 859.49 : x
2. Step 2: Convert to fraction form
   1,418.92/1,958.15 = 859.49/x
3. Step 3: Cross multiply
   1,418.92x = 1,958.15 × 859.49
4. Step 4: Simplify right side
   1,418.92x = 1,683,010.34
5. Step 5: Solve for x
   x = 1,683,010.34/1,418.92
6. Step 6: Final answer
   x = 1,186.12