Finding the Fourth Proportional to 2,137.73, 3,200.80 and 1,109.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.73 : 3,200.80 = 1,109.57 : x
2. Step 2: Convert to fraction form
   2,137.73/3,200.80 = 1,109.57/x
3. Step 3: Cross multiply
   2,137.73x = 3,200.80 × 1,109.57
4. Step 4: Simplify right side
   2,137.73x = 3,551,490.10
5. Step 5: Solve for x
   x = 3,551,490.10/2,137.73
6. Step 6: Final answer
   x = 1,661.34