Finding the Fourth Proportional to 12,940.48, 17,859.78 and 7,907.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.48 : 17,859.78 = 7,907.60 : x
2. Step 2: Convert to fraction form
   12,940.48/17,859.78 = 7,907.60/x
3. Step 3: Cross multiply
   12,940.48x = 17,859.78 × 7,907.60
4. Step 4: Simplify right side
   12,940.48x = 141,227,996.33
5. Step 5: Solve for x
   x = 141,227,996.33/12,940.48
6. Step 6: Final answer
   x = 10,913.66