Finding the Fourth Proportional to 21,300,664.86, 31,918,481.82 and 12,647,725.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300,664.86 : 31,918,481.82 = 12,647,725.23 : x
2. Step 2: Convert to fraction form
   21,300,664.86/31,918,481.82 = 12,647,725.23/x
3. Step 3: Cross multiply
   21,300,664.86x = 31,918,481.82 × 12,647,725.23
4. Step 4: Simplify right side
   21,300,664.86x = 403,696,187,818,110.31
5. Step 5: Solve for x
   x = 403,696,187,818,110.31/21,300,664.86
6. Step 6: Final answer
   x = 18,952,281.09