Finding the Fourth Proportional to 21,820.27, 30,112 and 12,388.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.27 : 30,112 = 12,388.83 : x
2. Step 2: Convert to fraction form
   21,820.27/30,112 = 12,388.83/x
3. Step 3: Cross multiply
   21,820.27x = 30,112 × 12,388.83
4. Step 4: Simplify right side
   21,820.27x = 373,052,448.96
5. Step 5: Solve for x
   x = 373,052,448.96/21,820.27
6. Step 6: Final answer
   x = 17,096.60