Finding the Fourth Proportional to 1,116.54, 1,540.83 and 619.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.54 : 1,540.83 = 619.20 : x
2. Step 2: Convert to fraction form
   1,116.54/1,540.83 = 619.20/x
3. Step 3: Cross multiply
   1,116.54x = 1,540.83 × 619.20
4. Step 4: Simplify right side
   1,116.54x = 954,081.94
5. Step 5: Solve for x
   x = 954,081.94/1,116.54
6. Step 6: Final answer
   x = 854.50