Finding the Fourth Proportional to 21,010.73, 31,532.49 and 7,866.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,010.73 : 31,532.49 = 7,866.86 : x
2. Step 2: Convert to fraction form
   21,010.73/31,532.49 = 7,866.86/x
3. Step 3: Cross multiply
   21,010.73x = 31,532.49 × 7,866.86
4. Step 4: Simplify right side
   21,010.73x = 248,061,526.62
5. Step 5: Solve for x
   x = 248,061,526.62/21,010.73
6. Step 6: Final answer
   x = 11,806.42