Finding the Fourth Proportional to 21,109.29, 31,659.62 and 7,954.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.29 : 31,659.62 = 7,954.41 : x
2. Step 2: Convert to fraction form
   21,109.29/31,659.62 = 7,954.41/x
3. Step 3: Cross multiply
   21,109.29x = 31,659.62 × 7,954.41
4. Step 4: Simplify right side
   21,109.29x = 251,833,558.15
5. Step 5: Solve for x
   x = 251,833,558.15/21,109.29
6. Step 6: Final answer
   x = 11,929.99