Finding the Fourth Proportional to 21,143,013,707.31, 29,169,101,326.10 and 12,105,942,462.51

Step by Step Solution

1. Step 1: Write the proportion equation
   21,143,013,707.31 : 29,169,101,326.10 = 12,105,942,462.51 : x
2. Step 2: Convert to fraction form
   21,143,013,707.31/29,169,101,326.10 = 12,105,942,462.51/x
3. Step 3: Cross multiply
   21,143,013,707.31x = 29,169,101,326.10 × 12,105,942,462.51
4. Step 4: Simplify right side
   21,143,013,707.31x = 353,119,462,336,830,242,816
5. Step 5: Solve for x
   x = 353,119,462,336,830,242,816/21,143,013,707.31
6. Step 6: Final answer
   x = 16,701,472,515.94