Finding the Fourth Proportional to 21,390,501.78, 29,522,666.29 and 12,693,469.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,390,501.78 : 29,522,666.29 = 12,693,469.82 : x
2. Step 2: Convert to fraction form
   21,390,501.78/29,522,666.29 = 12,693,469.82/x
3. Step 3: Cross multiply
   21,390,501.78x = 29,522,666.29 × 12,693,469.82
4. Step 4: Simplify right side
   21,390,501.78x = 374,745,073,558,046.38
5. Step 5: Solve for x
   x = 374,745,073,558,046.38/21,390,501.78
6. Step 6: Final answer
   x = 17,519,227.81