Finding the Fourth Proportional to 1,333.96, 1,839.17 and 861.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.96 : 1,839.17 = 861.05 : x
2. Step 2: Convert to fraction form
   1,333.96/1,839.17 = 861.05/x
3. Step 3: Cross multiply
   1,333.96x = 1,839.17 × 861.05
4. Step 4: Simplify right side
   1,333.96x = 1,583,617.33
5. Step 5: Solve for x
   x = 1,583,617.33/1,333.96
6. Step 6: Final answer
   x = 1,187.16