Finding the Fourth Proportional to 1,116.57, 1,540.73 and 619.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.57 : 1,540.73 = 619.09 : x
2. Step 2: Convert to fraction form
   1,116.57/1,540.73 = 619.09/x
3. Step 3: Cross multiply
   1,116.57x = 1,540.73 × 619.09
4. Step 4: Simplify right side
   1,116.57x = 953,849.39
5. Step 5: Solve for x
   x = 953,849.39/1,116.57
6. Step 6: Final answer
   x = 854.27