Finding the Fourth Proportional to 21,013.43, 31,529.71 and 7,866.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,013.43 : 31,529.71 = 7,866.82 : x
2. Step 2: Convert to fraction form
   21,013.43/31,529.71 = 7,866.82/x
3. Step 3: Cross multiply
   21,013.43x = 31,529.71 × 7,866.82
4. Step 4: Simplify right side
   21,013.43x = 248,038,513.89
5. Step 5: Solve for x
   x = 248,038,513.89/21,013.43
6. Step 6: Final answer
   x = 11,803.81