Finding the Fourth Proportional to 2,875.20, 4,311.24 and 1,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,875.20 : 4,311.24 = 1,230.72 : x
2. Step 2: Convert to fraction form
   2,875.20/4,311.24 = 1,230.72/x
3. Step 3: Cross multiply
   2,875.20x = 4,311.24 × 1,230.72
4. Step 4: Simplify right side
   2,875.20x = 5,305,929.29
5. Step 5: Solve for x
   x = 5,305,929.29/2,875.20
6. Step 6: Final answer
   x = 1,845.41