Finding the Fourth Proportional to 21,345,504.54, 31,966,638 and 12,219,924.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,345,504.54 : 31,966,638 = 12,219,924.42 : x
2. Step 2: Convert to fraction form
   21,345,504.54/31,966,638 = 12,219,924.42/x
3. Step 3: Cross multiply
   21,345,504.54x = 31,966,638 × 12,219,924.42
4. Step 4: Simplify right side
   21,345,504.54x = 390,629,900,321,499.94
5. Step 5: Solve for x
   x = 390,629,900,321,499.94/21,345,504.54
6. Step 6: Final answer
   x = 18,300,335.77