Finding the Fourth Proportional to 2,920.42, 4,359.83 and 2,817.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.42 : 4,359.83 = 2,817.90 : x
2. Step 2: Convert to fraction form
   2,920.42/4,359.83 = 2,817.90/x
3. Step 3: Cross multiply
   2,920.42x = 4,359.83 × 2,817.90
4. Step 4: Simplify right side
   2,920.42x = 12,285,564.96
5. Step 5: Solve for x
   x = 12,285,564.96/2,920.42
6. Step 6: Final answer
   x = 4,206.78