Finding the Fourth Proportional to 1,083.77, 1,495.71 and 641.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.77 : 1,495.71 = 641.82 : x
2. Step 2: Convert to fraction form
   1,083.77/1,495.71 = 641.82/x
3. Step 3: Cross multiply
   1,083.77x = 1,495.71 × 641.82
4. Step 4: Simplify right side
   1,083.77x = 959,976.59
5. Step 5: Solve for x
   x = 959,976.59/1,083.77
6. Step 6: Final answer
   x = 885.78