Finding the Fourth Proportional to 1,083.20, 1,494.72 and 641.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.20 : 1,494.72 = 641.12 : x
2. Step 2: Convert to fraction form
   1,083.20/1,494.72 = 641.12/x
3. Step 3: Cross multiply
   1,083.20x = 1,494.72 × 641.12
4. Step 4: Simplify right side
   1,083.20x = 958,287.41
5. Step 5: Solve for x
   x = 958,287.41/1,083.20
6. Step 6: Final answer
   x = 884.69