Finding the Fourth Proportional to 1,116.78, 1,541.15 and 619.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.78 : 1,541.15 = 619.42 : x
2. Step 2: Convert to fraction form
   1,116.78/1,541.15 = 619.42/x
3. Step 3: Cross multiply
   1,116.78x = 1,541.15 × 619.42
4. Step 4: Simplify right side
   1,116.78x = 954,619.13
5. Step 5: Solve for x
   x = 954,619.13/1,116.78
6. Step 6: Final answer
   x = 854.80