Finding the Fourth Proportional to 1,116.90, 1,541.43 and 619.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.90 : 1,541.43 = 619.56 : x
2. Step 2: Convert to fraction form
   1,116.90/1,541.43 = 619.56/x
3. Step 3: Cross multiply
   1,116.90x = 1,541.43 × 619.56
4. Step 4: Simplify right side
   1,116.90x = 955,008.37
5. Step 5: Solve for x
   x = 955,008.37/1,116.90
6. Step 6: Final answer
   x = 855.05