Finding the Fourth Proportional to 1,083.69, 1,495.43 and 641.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.69 : 1,495.43 = 641.73 : x
2. Step 2: Convert to fraction form
   1,083.69/1,495.43 = 641.73/x
3. Step 3: Cross multiply
   1,083.69x = 1,495.43 × 641.73
4. Step 4: Simplify right side
   1,083.69x = 959,662.29
5. Step 5: Solve for x
   x = 959,662.29/1,083.69
6. Step 6: Final answer
   x = 885.55