Finding the Fourth Proportional to 21,820.26, 30,111.57 and 12,388.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.26 : 30,111.57 = 12,388.62 : x
2. Step 2: Convert to fraction form
   21,820.26/30,111.57 = 12,388.62/x
3. Step 3: Cross multiply
   21,820.26x = 30,111.57 × 12,388.62
4. Step 4: Simplify right side
   21,820.26x = 373,040,798.33
5. Step 5: Solve for x
   x = 373,040,798.33/21,820.26
6. Step 6: Final answer
   x = 17,096.07