Finding the Fourth Proportional to 21,820.22, 30,111.90 and 11,884.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.22 : 30,111.90 = 11,884.22 : x
2. Step 2: Convert to fraction form
   21,820.22/30,111.90 = 11,884.22/x
3. Step 3: Cross multiply
   21,820.22x = 30,111.90 × 11,884.22
4. Step 4: Simplify right side
   21,820.22x = 357,856,428.86
5. Step 5: Solve for x
   x = 357,856,428.86/21,820.22
6. Step 6: Final answer
   x = 16,400.22