Finding the Fourth Proportional to 21,388.05, 32,086.63 and 10,859.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,388.05 : 32,086.63 = 10,859.47 : x
2. Step 2: Convert to fraction form
   21,388.05/32,086.63 = 10,859.47/x
3. Step 3: Cross multiply
   21,388.05x = 32,086.63 × 10,859.47
4. Step 4: Simplify right side
   21,388.05x = 348,443,729.24
5. Step 5: Solve for x
   x = 348,443,729.24/21,388.05
6. Step 6: Final answer
   x = 16,291.51