Finding the Fourth Proportional to 21,152.88, 31,729.83 and 7,113.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,152.88 : 31,729.83 = 7,113.09 : x
2. Step 2: Convert to fraction form
   21,152.88/31,729.83 = 7,113.09/x
3. Step 3: Cross multiply
   21,152.88x = 31,729.83 × 7,113.09
4. Step 4: Simplify right side
   21,152.88x = 225,697,136.47
5. Step 5: Solve for x
   x = 225,697,136.47/21,152.88
6. Step 6: Final answer
   x = 10,669.81