Finding the Fourth Proportional to 3,099.32, 4,278.72 and 2,389.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,099.32 : 4,278.72 = 2,389.62 : x
2. Step 2: Convert to fraction form
   3,099.32/4,278.72 = 2,389.62/x
3. Step 3: Cross multiply
   3,099.32x = 4,278.72 × 2,389.62
4. Step 4: Simplify right side
   3,099.32x = 10,224,514.89
5. Step 5: Solve for x
   x = 10,224,514.89/3,099.32
6. Step 6: Final answer
   x = 3,298.95