Finding the Fourth Proportional to 21,294.72, 31,961.75 and 10,772.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,294.72 : 31,961.75 = 10,772.15 : x
2. Step 2: Convert to fraction form
   21,294.72/31,961.75 = 10,772.15/x
3. Step 3: Cross multiply
   21,294.72x = 31,961.75 × 10,772.15
4. Step 4: Simplify right side
   21,294.72x = 344,296,551.59
5. Step 5: Solve for x
   x = 344,296,551.59/21,294.72
6. Step 6: Final answer
   x = 16,168.17