Finding the Fourth Proportional to 3,909.15, 5,864.96 and 1,719.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.15 : 5,864.96 = 1,719.72 : x
2. Step 2: Convert to fraction form
   3,909.15/5,864.96 = 1,719.72/x
3. Step 3: Cross multiply
   3,909.15x = 5,864.96 × 1,719.72
4. Step 4: Simplify right side
   3,909.15x = 10,086,080.41
5. Step 5: Solve for x
   x = 10,086,080.41/3,909.15
6. Step 6: Final answer
   x = 2,580.12