Finding the Fourth Proportional to 1,083.95, 1,495.59 and 641.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.95 : 1,495.59 = 641.96 : x
2. Step 2: Convert to fraction form
   1,083.95/1,495.59 = 641.96/x
3. Step 3: Cross multiply
   1,083.95x = 1,495.59 × 641.96
4. Step 4: Simplify right side
   1,083.95x = 960,108.96
5. Step 5: Solve for x
   x = 960,108.96/1,083.95
6. Step 6: Final answer
   x = 885.75