Finding the Fourth Proportional to 21,184, 31,755.34 and 10,087.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,184 : 31,755.34 = 10,087.72 : x
2. Step 2: Convert to fraction form
   21,184/31,755.34 = 10,087.72/x
3. Step 3: Cross multiply
   21,184x = 31,755.34 × 10,087.72
4. Step 4: Simplify right side
   21,184x = 320,338,978.42
5. Step 5: Solve for x
   x = 320,338,978.42/21,184
6. Step 6: Final answer
   x = 15,121.74