Finding the Fourth Proportional to 3,917.20, 5,876.89 and 1,809.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,917.20 : 5,876.89 = 1,809.47 : x
2. Step 2: Convert to fraction form
   3,917.20/5,876.89 = 1,809.47/x
3. Step 3: Cross multiply
   3,917.20x = 5,876.89 × 1,809.47
4. Step 4: Simplify right side
   3,917.20x = 10,634,047.10
5. Step 5: Solve for x
   x = 10,634,047.10/3,917.20
6. Step 6: Final answer
   x = 2,714.71