Finding the Fourth Proportional to 1,116.51, 1,540.76 and 619.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.51 : 1,540.76 = 619.15 : x
2. Step 2: Convert to fraction form
   1,116.51/1,540.76 = 619.15/x
3. Step 3: Cross multiply
   1,116.51x = 1,540.76 × 619.15
4. Step 4: Simplify right side
   1,116.51x = 953,959.25
5. Step 5: Solve for x
   x = 953,959.25/1,116.51
6. Step 6: Final answer
   x = 854.41