Finding the Fourth Proportional to 21,097.16, 31,647.90 and 7,960.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,097.16 : 31,647.90 = 7,960.58 : x
2. Step 2: Convert to fraction form
   21,097.16/31,647.90 = 7,960.58/x
3. Step 3: Cross multiply
   21,097.16x = 31,647.90 × 7,960.58
4. Step 4: Simplify right side
   21,097.16x = 251,935,639.78
5. Step 5: Solve for x
   x = 251,935,639.78/21,097.16
6. Step 6: Final answer
   x = 11,941.69