Finding the Fourth Proportional to 2,761.10, 3,809.69 and 2,015.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,761.10 : 3,809.69 = 2,015.47 : x
2. Step 2: Convert to fraction form
   2,761.10/3,809.69 = 2,015.47/x
3. Step 3: Cross multiply
   2,761.10x = 3,809.69 × 2,015.47
4. Step 4: Simplify right side
   2,761.10x = 7,678,301.89
5. Step 5: Solve for x
   x = 7,678,301.89/2,761.10
6. Step 6: Final answer
   x = 2,780.89