Finding the Fourth Proportional to 21,234.52, 31,839.48 and 7,189.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,234.52 : 31,839.48 = 7,189.86 : x
2. Step 2: Convert to fraction form
   21,234.52/31,839.48 = 7,189.86/x
3. Step 3: Cross multiply
   21,234.52x = 31,839.48 × 7,189.86
4. Step 4: Simplify right side
   21,234.52x = 228,921,367.72
5. Step 5: Solve for x
   x = 228,921,367.72/21,234.52
6. Step 6: Final answer
   x = 10,780.62