Finding the Fourth Proportional to 21,978,781.12, 30,332,533.68 and 12,192,380.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978,781.12 : 30,332,533.68 = 12,192,380.56 : x
2. Step 2: Convert to fraction form
   21,978,781.12/30,332,533.68 = 12,192,380.56/x
3. Step 3: Cross multiply
   21,978,781.12x = 30,332,533.68 × 12,192,380.56
4. Step 4: Simplify right side
   21,978,781.12x = 369,825,793,975,577.25
5. Step 5: Solve for x
   x = 369,825,793,975,577.25/21,978,781.12
6. Step 6: Final answer
   x = 16,826,492.42