Finding the Fourth Proportional to 22,400.12, 30,911.59 and 12,190.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,400.12 : 30,911.59 = 12,190.72 : x
2. Step 2: Convert to fraction form
   22,400.12/30,911.59 = 12,190.72/x
3. Step 3: Cross multiply
   22,400.12x = 30,911.59 × 12,190.72
4. Step 4: Simplify right side
   22,400.12x = 376,834,383.89
5. Step 5: Solve for x
   x = 376,834,383.89/22,400.12
6. Step 6: Final answer
   x = 16,822.88