Finding the Fourth Proportional to 1,418.99, 1,958.36 and 859.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.99 : 1,958.36 = 859.77 : x
2. Step 2: Convert to fraction form
   1,418.99/1,958.36 = 859.77/x
3. Step 3: Cross multiply
   1,418.99x = 1,958.36 × 859.77
4. Step 4: Simplify right side
   1,418.99x = 1,683,739.18
5. Step 5: Solve for x
   x = 1,683,739.18/1,418.99
6. Step 6: Final answer
   x = 1,186.58