Finding the Fourth Proportional to 21,196.88, 31,795.44 and 7,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.88 : 31,795.44 = 7,172.72 : x
2. Step 2: Convert to fraction form
   21,196.88/31,795.44 = 7,172.72/x
3. Step 3: Cross multiply
   21,196.88x = 31,795.44 × 7,172.72
4. Step 4: Simplify right side
   21,196.88x = 228,059,788.40
5. Step 5: Solve for x
   x = 228,059,788.40/21,196.88
6. Step 6: Final answer
   x = 10,759.12