Finding the Fourth Proportional to 1,116.68, 1,540.98 and 619.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.68 : 1,540.98 = 619.31 : x
2. Step 2: Convert to fraction form
   1,116.68/1,540.98 = 619.31/x
3. Step 3: Cross multiply
   1,116.68x = 1,540.98 × 619.31
4. Step 4: Simplify right side
   1,116.68x = 954,344.32
5. Step 5: Solve for x
   x = 954,344.32/1,116.68
6. Step 6: Final answer
   x = 854.63