Finding the Fourth Proportional to 21,990.72, 32,970.42 and 10,297.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,990.72 : 32,970.42 = 10,297.56 : x
2. Step 2: Convert to fraction form
   21,990.72/32,970.42 = 10,297.56/x
3. Step 3: Cross multiply
   21,990.72x = 32,970.42 × 10,297.56
4. Step 4: Simplify right side
   21,990.72x = 339,514,878.18
5. Step 5: Solve for x
   x = 339,514,878.18/21,990.72
6. Step 6: Final answer
   x = 15,439.01