Finding the Fourth Proportional to 12,940.36, 17,866.54 and 9,910.13

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.36 : 17,866.54 = 9,910.13 : x
2. Step 2: Convert to fraction form
   12,940.36/17,866.54 = 9,910.13/x
3. Step 3: Cross multiply
   12,940.36x = 17,866.54 × 9,910.13
4. Step 4: Simplify right side
   12,940.36x = 177,059,644.72
5. Step 5: Solve for x
   x = 177,059,644.72/12,940.36
6. Step 6: Final answer
   x = 13,682.75