Finding the Fourth Proportional to 1,418.56, 1,956.96 and 859.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.56 : 1,956.96 = 859.06 : x
2. Step 2: Convert to fraction form
   1,418.56/1,956.96 = 859.06/x
3. Step 3: Cross multiply
   1,418.56x = 1,956.96 × 859.06
4. Step 4: Simplify right side
   1,418.56x = 1,681,146.06
5. Step 5: Solve for x
   x = 1,681,146.06/1,418.56
6. Step 6: Final answer
   x = 1,185.11