Finding the Fourth Proportional to 21,830.23, 30,112.59 and 13,328.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,830.23 : 30,112.59 = 13,328.47 : x
2. Step 2: Convert to fraction form
   21,830.23/30,112.59 = 13,328.47/x
3. Step 3: Cross multiply
   21,830.23x = 30,112.59 × 13,328.47
4. Step 4: Simplify right side
   21,830.23x = 401,354,752.44
5. Step 5: Solve for x
   x = 401,354,752.44/21,830.23
6. Step 6: Final answer
   x = 18,385.27