Finding the Fourth Proportional to 12,978,629.82, 19,457,446.59 and 7,928,234.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978,629.82 : 19,457,446.59 = 7,928,234.46 : x
2. Step 2: Convert to fraction form
   12,978,629.82/19,457,446.59 = 7,928,234.46/x
3. Step 3: Cross multiply
   12,978,629.82x = 19,457,446.59 × 7,928,234.46
4. Step 4: Simplify right side
   12,978,629.82x = 154,263,198,558,447.50
5. Step 5: Solve for x
   x = 154,263,198,558,447.50/12,978,629.82
6. Step 6: Final answer
   x = 11,885,938.71