Finding the Fourth Proportional to 21,978.09, 32,963.49 and 7,935.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.09 : 32,963.49 = 7,935.42 : x
2. Step 2: Convert to fraction form
   21,978.09/32,963.49 = 7,935.42/x
3. Step 3: Cross multiply
   21,978.09x = 32,963.49 × 7,935.42
4. Step 4: Simplify right side
   21,978.09x = 261,579,137.82
5. Step 5: Solve for x
   x = 261,579,137.82/21,978.09
6. Step 6: Final answer
   x = 11,901.81