Finding the Fourth Proportional to 1,085.64, 1,498.26 and 619.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.64 : 1,498.26 = 619.96 : x
2. Step 2: Convert to fraction form
   1,085.64/1,498.26 = 619.96/x
3. Step 3: Cross multiply
   1,085.64x = 1,498.26 × 619.96
4. Step 4: Simplify right side
   1,085.64x = 928,861.27
5. Step 5: Solve for x
   x = 928,861.27/1,085.64
6. Step 6: Final answer
   x = 855.59