Finding the Fourth Proportional to 918.27, 1,267.83 and 859.50

Step by Step Solution

1. Step 1: Write the proportion equation
   918.27 : 1,267.83 = 859.50 : x
2. Step 2: Convert to fraction form
   918.27/1,267.83 = 859.50/x
3. Step 3: Cross multiply
   918.27x = 1,267.83 × 859.50
4. Step 4: Simplify right side
   918.27x = 1,089,699.89
5. Step 5: Solve for x
   x = 1,089,699.89/918.27
6. Step 6: Final answer
   x = 1,186.69