Finding the Fourth Proportional to 10,890.38, 16,335.76 and 3,099.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.38 : 16,335.76 = 3,099.40 : x
2. Step 2: Convert to fraction form
   10,890.38/16,335.76 = 3,099.40/x
3. Step 3: Cross multiply
   10,890.38x = 16,335.76 × 3,099.40
4. Step 4: Simplify right side
   10,890.38x = 50,631,054.54
5. Step 5: Solve for x
   x = 50,631,054.54/10,890.38
6. Step 6: Final answer
   x = 4,649.15