Finding the Fourth Proportional to 10,930.50, 16,398.52 and 3,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,930.50 : 16,398.52 = 3,139.31 : x
2. Step 2: Convert to fraction form
   10,930.50/16,398.52 = 3,139.31/x
3. Step 3: Cross multiply
   10,930.50x = 16,398.52 × 3,139.31
4. Step 4: Simplify right side
   10,930.50x = 51,480,070.97
5. Step 5: Solve for x
   x = 51,480,070.97/10,930.50
6. Step 6: Final answer
   x = 4,709.76