Finding the Fourth Proportional to 21,997.78, 32,997.30 and 7,959.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,997.78 : 32,997.30 = 7,959.10 : x
2. Step 2: Convert to fraction form
   21,997.78/32,997.30 = 7,959.10/x
3. Step 3: Cross multiply
   21,997.78x = 32,997.30 × 7,959.10
4. Step 4: Simplify right side
   21,997.78x = 262,628,810.43
5. Step 5: Solve for x
   x = 262,628,810.43/21,997.78
6. Step 6: Final answer
   x = 11,938.88