Finding the Fourth Proportional to 3,909.46, 5,861.59 and 2,155.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.46 : 5,861.59 = 2,155.30 : x
2. Step 2: Convert to fraction form
   3,909.46/5,861.59 = 2,155.30/x
3. Step 3: Cross multiply
   3,909.46x = 5,861.59 × 2,155.30
4. Step 4: Simplify right side
   3,909.46x = 12,633,484.93
5. Step 5: Solve for x
   x = 12,633,484.93/3,909.46
6. Step 6: Final answer
   x = 3,231.52