Finding the Fourth Proportional to 21,968.16, 30,320.64 and 20,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,968.16 : 30,320.64 = 20,196.96 : x
2. Step 2: Convert to fraction form
   21,968.16/30,320.64 = 20,196.96/x
3. Step 3: Cross multiply
   21,968.16x = 30,320.64 × 20,196.96
4. Step 4: Simplify right side
   21,968.16x = 612,384,753.25
5. Step 5: Solve for x
   x = 612,384,753.25/21,968.16
6. Step 6: Final answer
   x = 27,876.01