Finding the Fourth Proportional to 2,113.86, 3,171.31 and 727.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.86 : 3,171.31 = 727.22 : x
2. Step 2: Convert to fraction form
   2,113.86/3,171.31 = 727.22/x
3. Step 3: Cross multiply
   2,113.86x = 3,171.31 × 727.22
4. Step 4: Simplify right side
   2,113.86x = 2,306,222.38
5. Step 5: Solve for x
   x = 2,306,222.38/2,113.86
6. Step 6: Final answer
   x = 1,091.00