Finding the Fourth Proportional to 1,085.58, 1,498.23 and 619.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.58 : 1,498.23 = 619.74 : x
2. Step 2: Convert to fraction form
   1,085.58/1,498.23 = 619.74/x
3. Step 3: Cross multiply
   1,085.58x = 1,498.23 × 619.74
4. Step 4: Simplify right side
   1,085.58x = 928,513.06
5. Step 5: Solve for x
   x = 928,513.06/1,085.58
6. Step 6: Final answer
   x = 855.32