Finding the Fourth Proportional to 12,940.21, 19,443.12 and 8,262.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.21 : 19,443.12 = 8,262.46 : x
2. Step 2: Convert to fraction form
   12,940.21/19,443.12 = 8,262.46/x
3. Step 3: Cross multiply
   12,940.21x = 19,443.12 × 8,262.46
4. Step 4: Simplify right side
   12,940.21x = 160,648,001.28
5. Step 5: Solve for x
   x = 160,648,001.28/12,940.21
6. Step 6: Final answer
   x = 12,414.64