Finding the Fourth Proportional to 1,085.64, 1,497.98 and 619.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.64 : 1,497.98 = 619.89 : x
2. Step 2: Convert to fraction form
   1,085.64/1,497.98 = 619.89/x
3. Step 3: Cross multiply
   1,085.64x = 1,497.98 × 619.89
4. Step 4: Simplify right side
   1,085.64x = 928,579.72
5. Step 5: Solve for x
   x = 928,579.72/1,085.64
6. Step 6: Final answer
   x = 855.33