Finding the Fourth Proportional to 1,116.61, 1,540.88 and 619.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.61 : 1,540.88 = 619.30 : x
2. Step 2: Convert to fraction form
   1,116.61/1,540.88 = 619.30/x
3. Step 3: Cross multiply
   1,116.61x = 1,540.88 × 619.30
4. Step 4: Simplify right side
   1,116.61x = 954,259.47
5. Step 5: Solve for x
   x = 954,259.47/1,116.61
6. Step 6: Final answer
   x = 854.61