Finding the Fourth Proportional to 11,709.90, 16,164.47 and 7,938.23

Step by Step Solution

1. Step 1: Write the proportion equation
   11,709.90 : 16,164.47 = 7,938.23 : x
2. Step 2: Convert to fraction form
   11,709.90/16,164.47 = 7,938.23/x
3. Step 3: Cross multiply
   11,709.90x = 16,164.47 × 7,938.23
4. Step 4: Simplify right side
   11,709.90x = 128,317,280.69
5. Step 5: Solve for x
   x = 128,317,280.69/11,709.90
6. Step 6: Final answer
   x = 10,958.02