Finding the Fourth Proportional to 2,072.61, 3,103.92 and 1,329.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.61 : 3,103.92 = 1,329.57 : x
2. Step 2: Convert to fraction form
   2,072.61/3,103.92 = 1,329.57/x
3. Step 3: Cross multiply
   2,072.61x = 3,103.92 × 1,329.57
4. Step 4: Simplify right side
   2,072.61x = 4,126,878.91
5. Step 5: Solve for x
   x = 4,126,878.91/2,072.61
6. Step 6: Final answer
   x = 1,991.15