Finding the Fourth Proportional to 1,085.68, 1,498.16 and 619.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.68 : 1,498.16 = 619.92 : x
2. Step 2: Convert to fraction form
   1,085.68/1,498.16 = 619.92/x
3. Step 3: Cross multiply
   1,085.68x = 1,498.16 × 619.92
4. Step 4: Simplify right side
   1,085.68x = 928,739.35
5. Step 5: Solve for x
   x = 928,739.35/1,085.68
6. Step 6: Final answer
   x = 855.44