Finding the Fourth Proportional to 21,911.58, 30,239.06 and 12,355.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,911.58 : 30,239.06 = 12,355.47 : x
2. Step 2: Convert to fraction form
   21,911.58/30,239.06 = 12,355.47/x
3. Step 3: Cross multiply
   21,911.58x = 30,239.06 × 12,355.47
4. Step 4: Simplify right side
   21,911.58x = 373,617,736.88
5. Step 5: Solve for x
   x = 373,617,736.88/21,911.58
6. Step 6: Final answer
   x = 17,051.15