Finding the Fourth Proportional to 1,085.70, 1,498.24 and 620.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.70 : 1,498.24 = 620.04 : x
2. Step 2: Convert to fraction form
   1,085.70/1,498.24 = 620.04/x
3. Step 3: Cross multiply
   1,085.70x = 1,498.24 × 620.04
4. Step 4: Simplify right side
   1,085.70x = 928,968.73
5. Step 5: Solve for x
   x = 928,968.73/1,085.70
6. Step 6: Final answer
   x = 855.64