Finding the Fourth Proportional to 21,978.72, 32,952.38 and 10,285.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.72 : 32,952.38 = 10,285.56 : x
2. Step 2: Convert to fraction form
   21,978.72/32,952.38 = 10,285.56/x
3. Step 3: Cross multiply
   21,978.72x = 32,952.38 × 10,285.56
4. Step 4: Simplify right side
   21,978.72x = 338,933,630.21
5. Step 5: Solve for x
   x = 338,933,630.21/21,978.72
6. Step 6: Final answer
   x = 15,420.99