Finding the Fourth Proportional to 2,861.71, 4,289.83 and 1,215.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.71 : 4,289.83 = 1,215.99 : x
2. Step 2: Convert to fraction form
   2,861.71/4,289.83 = 1,215.99/x
3. Step 3: Cross multiply
   2,861.71x = 4,289.83 × 1,215.99
4. Step 4: Simplify right side
   2,861.71x = 5,216,387.34
5. Step 5: Solve for x
   x = 5,216,387.34/2,861.71
6. Step 6: Final answer
   x = 1,822.82