Finding the Fourth Proportional to 21,320,052,485,061, 29,421,672,429,381 and 12,195,525,128,128

Step by Step Solution

1. Step 1: Write the proportion equation
   21,320,052,485,061 : 29,421,672,429,381 = 12,195,525,128,128 : x
2. Step 2: Convert to fraction form
   21,320,052,485,061/29,421,672,429,381 = 12,195,525,128,128/x
3. Step 3: Cross multiply
   21,320,052,485,061x = 29,421,672,429,381 × 12,195,525,128,128
4. Step 4: Simplify right side
   21,320,052,485,061x = 358,812,745,424,066,793,917,382,656
5. Step 5: Solve for x
   x = 358,812,745,424,066,793,917,382,656/21,320,052,485,061
6. Step 6: Final answer
   x = 16,829,824,676,814.82