Finding the Fourth Proportional to 2,861.64, 4,287.72 and 1,819.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.64 : 4,287.72 = 1,819.80 : x
2. Step 2: Convert to fraction form
   2,861.64/4,287.72 = 1,819.80/x
3. Step 3: Cross multiply
   2,861.64x = 4,287.72 × 1,819.80
4. Step 4: Simplify right side
   2,861.64x = 7,802,792.86
5. Step 5: Solve for x
   x = 7,802,792.86/2,861.64
6. Step 6: Final answer
   x = 2,726.69