Finding the Fourth Proportional to 21,076.72, 31,604.55 and 7,031.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,076.72 : 31,604.55 = 7,031.86 : x
2. Step 2: Convert to fraction form
   21,076.72/31,604.55 = 7,031.86/x
3. Step 3: Cross multiply
   21,076.72x = 31,604.55 × 7,031.86
4. Step 4: Simplify right side
   21,076.72x = 222,238,770.96
5. Step 5: Solve for x
   x = 222,238,770.96/21,076.72
6. Step 6: Final answer
   x = 10,544.28