Finding the Fourth Proportional to 21,142,216,986.53, 29,177,026,561.55 and 12,111,720,408.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,142,216,986.53 : 29,177,026,561.55 = 12,111,720,408.89 : x
2. Step 2: Convert to fraction form
   21,142,216,986.53/29,177,026,561.55 = 12,111,720,408.89/x
3. Step 3: Cross multiply
   21,142,216,986.53x = 29,177,026,561.55 × 12,111,720,408.89
4. Step 4: Simplify right side
   21,142,216,986.53x = 353,383,988,076,141,215,744
5. Step 5: Solve for x
   x = 353,383,988,076,141,215,744/21,142,216,986.53
6. Step 6: Final answer
   x = 16,714,613,623.60