Finding the Fourth Proportional to 21,153.75, 31,731.15 and 7,113.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,153.75 : 31,731.15 = 7,113.96 : x
2. Step 2: Convert to fraction form
   21,153.75/31,731.15 = 7,113.96/x
3. Step 3: Cross multiply
   21,153.75x = 31,731.15 × 7,113.96
4. Step 4: Simplify right side
   21,153.75x = 225,734,131.85
5. Step 5: Solve for x
   x = 225,734,131.85/21,153.75
6. Step 6: Final answer
   x = 10,671.12