Finding the Fourth Proportional to 21,033.42, 31,540.89 and 7,876.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,033.42 : 31,540.89 = 7,876.56 : x
2. Step 2: Convert to fraction form
   21,033.42/31,540.89 = 7,876.56/x
3. Step 3: Cross multiply
   21,033.42x = 31,540.89 × 7,876.56
4. Step 4: Simplify right side
   21,033.42x = 248,433,712.54
5. Step 5: Solve for x
   x = 248,433,712.54/21,033.42
6. Step 6: Final answer
   x = 11,811.38