Finding the Fourth Proportional to 21,820.16, 30,108.54 and 12,258.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.16 : 30,108.54 = 12,258.22 : x
2. Step 2: Convert to fraction form
   21,820.16/30,108.54 = 12,258.22/x
3. Step 3: Cross multiply
   21,820.16x = 30,108.54 × 12,258.22
4. Step 4: Simplify right side
   21,820.16x = 369,077,107.20
5. Step 5: Solve for x
   x = 369,077,107.20/21,820.16
6. Step 6: Final answer
   x = 16,914.50