Finding the Fourth Proportional to 1,116.53, 1,540.82 and 619.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.53 : 1,540.82 = 619.21 : x
2. Step 2: Convert to fraction form
   1,116.53/1,540.82 = 619.21/x
3. Step 3: Cross multiply
   1,116.53x = 1,540.82 × 619.21
4. Step 4: Simplify right side
   1,116.53x = 954,080.35
5. Step 5: Solve for x
   x = 954,080.35/1,116.53
6. Step 6: Final answer
   x = 854.51