Finding the Fourth Proportional to 21,148.50, 31,723.29 and 7,109.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,148.50 : 31,723.29 = 7,109.04 : x
2. Step 2: Convert to fraction form
   21,148.50/31,723.29 = 7,109.04/x
3. Step 3: Cross multiply
   21,148.50x = 31,723.29 × 7,109.04
4. Step 4: Simplify right side
   21,148.50x = 225,522,137.54
5. Step 5: Solve for x
   x = 225,522,137.54/21,148.50
6. Step 6: Final answer
   x = 10,663.74