Finding the Fourth Proportional to 1,016.54, 1,401.99 and 859.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.54 : 1,401.99 = 859.55 : x
2. Step 2: Convert to fraction form
   1,016.54/1,401.99 = 859.55/x
3. Step 3: Cross multiply
   1,016.54x = 1,401.99 × 859.55
4. Step 4: Simplify right side
   1,016.54x = 1,205,080.50
5. Step 5: Solve for x
   x = 1,205,080.50/1,016.54
6. Step 6: Final answer
   x = 1,185.47