Finding the Fourth Proportional to 2,081.45, 2,872.30 and 1,137.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.45 : 2,872.30 = 1,137.28 : x
2. Step 2: Convert to fraction form
   2,081.45/2,872.30 = 1,137.28/x
3. Step 3: Cross multiply
   2,081.45x = 2,872.30 × 1,137.28
4. Step 4: Simplify right side
   2,081.45x = 3,266,609.34
5. Step 5: Solve for x
   x = 3,266,609.34/2,081.45
6. Step 6: Final answer
   x = 1,569.39