Finding the Fourth Proportional to 1,083.92, 1,495.59 and 641.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.92 : 1,495.59 = 641.89 : x
2. Step 2: Convert to fraction form
   1,083.92/1,495.59 = 641.89/x
3. Step 3: Cross multiply
   1,083.92x = 1,495.59 × 641.89
4. Step 4: Simplify right side
   1,083.92x = 960,004.27
5. Step 5: Solve for x
   x = 960,004.27/1,083.92
6. Step 6: Final answer
   x = 885.68