Finding the Fourth Proportional to 3,789.86, 5,680.17 and 1,709.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,789.86 : 5,680.17 = 1,709.30 : x
2. Step 2: Convert to fraction form
   3,789.86/5,680.17 = 1,709.30/x
3. Step 3: Cross multiply
   3,789.86x = 5,680.17 × 1,709.30
4. Step 4: Simplify right side
   3,789.86x = 9,709,128.78
5. Step 5: Solve for x
   x = 9,709,128.78/3,789.86
6. Step 6: Final answer
   x = 2,561.87