Finding the Fourth Proportional to 10,930.84, 16,396.98 and 3,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,930.84 : 16,396.98 = 3,139.72 : x
2. Step 2: Convert to fraction form
   10,930.84/16,396.98 = 3,139.72/x
3. Step 3: Cross multiply
   10,930.84x = 16,396.98 × 3,139.72
4. Step 4: Simplify right side
   10,930.84x = 51,481,926.05
5. Step 5: Solve for x
   x = 51,481,926.05/10,930.84
6. Step 6: Final answer
   x = 4,709.79