Finding the Fourth Proportional to 21,990.80, 32,979.37 and 7,196.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,990.80 : 32,979.37 = 7,196.43 : x
2. Step 2: Convert to fraction form
   21,990.80/32,979.37 = 7,196.43/x
3. Step 3: Cross multiply
   21,990.80x = 32,979.37 × 7,196.43
4. Step 4: Simplify right side
   21,990.80x = 237,333,727.65
5. Step 5: Solve for x
   x = 237,333,727.65/21,990.80
6. Step 6: Final answer
   x = 10,792.41