Finding the Fourth Proportional to 1,418.70, 1,958.56 and 859.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.70 : 1,958.56 = 859.52 : x
2. Step 2: Convert to fraction form
   1,418.70/1,958.56 = 859.52/x
3. Step 3: Cross multiply
   1,418.70x = 1,958.56 × 859.52
4. Step 4: Simplify right side
   1,418.70x = 1,683,421.49
5. Step 5: Solve for x
   x = 1,683,421.49/1,418.70
6. Step 6: Final answer
   x = 1,186.59