Finding the Fourth Proportional to 21,388.32, 32,086.50 and 8,239.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,388.32 : 32,086.50 = 8,239.56 : x
2. Step 2: Convert to fraction form
   21,388.32/32,086.50 = 8,239.56/x
3. Step 3: Cross multiply
   21,388.32x = 32,086.50 × 8,239.56
4. Step 4: Simplify right side
   21,388.32x = 264,378,641.94
5. Step 5: Solve for x
   x = 264,378,641.94/21,388.32
6. Step 6: Final answer
   x = 12,360.89