Finding the Fourth Proportional to 1,909.76, 2,861.90 and 1,086.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.76 : 2,861.90 = 1,086.29 : x
2. Step 2: Convert to fraction form
   1,909.76/2,861.90 = 1,086.29/x
3. Step 3: Cross multiply
   1,909.76x = 2,861.90 × 1,086.29
4. Step 4: Simplify right side
   1,909.76x = 3,108,833.61
5. Step 5: Solve for x
   x = 3,108,833.61/1,909.76
6. Step 6: Final answer
   x = 1,627.87