Finding the Fourth Proportional to 3,702.73, 5,109.78 and 2,109.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,702.73 : 5,109.78 = 2,109.31 : x
2. Step 2: Convert to fraction form
   3,702.73/5,109.78 = 2,109.31/x
3. Step 3: Cross multiply
   3,702.73x = 5,109.78 × 2,109.31
4. Step 4: Simplify right side
   3,702.73x = 10,778,110.05
5. Step 5: Solve for x
   x = 10,778,110.05/3,702.73
6. Step 6: Final answer
   x = 2,910.85