Finding the Fourth Proportional to 10,940.81, 16,307.28 and 10,318.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,940.81 : 16,307.28 = 10,318.10 : x
2. Step 2: Convert to fraction form
   10,940.81/16,307.28 = 10,318.10/x
3. Step 3: Cross multiply
   10,940.81x = 16,307.28 × 10,318.10
4. Step 4: Simplify right side
   10,940.81x = 168,260,064.23
5. Step 5: Solve for x
   x = 168,260,064.23/10,940.81
6. Step 6: Final answer
   x = 15,379.13