Finding the Fourth Proportional to 12,940.42, 17,851.62 and 7,631.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.42 : 17,851.62 = 7,631.68 : x
2. Step 2: Convert to fraction form
   12,940.42/17,851.62 = 7,631.68/x
3. Step 3: Cross multiply
   12,940.42x = 17,851.62 × 7,631.68
4. Step 4: Simplify right side
   12,940.42x = 136,237,851.32
5. Step 5: Solve for x
   x = 136,237,851.32/12,940.42
6. Step 6: Final answer
   x = 10,528.09