Finding the Fourth Proportional to 21,294.72, 31,920.48 and 10,185.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,294.72 : 31,920.48 = 10,185.12 : x
2. Step 2: Convert to fraction form
   21,294.72/31,920.48 = 10,185.12/x
3. Step 3: Cross multiply
   21,294.72x = 31,920.48 × 10,185.12
4. Step 4: Simplify right side
   21,294.72x = 325,113,919.26
5. Step 5: Solve for x
   x = 325,113,919.26/21,294.72
6. Step 6: Final answer
   x = 15,267.35