Finding the Fourth Proportional to 1,085.85, 1,498.41 and 620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.85 : 1,498.41 = 620.10 : x
2. Step 2: Convert to fraction form
   1,085.85/1,498.41 = 620.10/x
3. Step 3: Cross multiply
   1,085.85x = 1,498.41 × 620.10
4. Step 4: Simplify right side
   1,085.85x = 929,164.04
5. Step 5: Solve for x
   x = 929,164.04/1,085.85
6. Step 6: Final answer
   x = 855.70