Finding the Fourth Proportional to 12,736.78, 17,554.89 and 10,961.26

Step by Step Solution

1. Step 1: Write the proportion equation
   12,736.78 : 17,554.89 = 10,961.26 : x
2. Step 2: Convert to fraction form
   12,736.78/17,554.89 = 10,961.26/x
3. Step 3: Cross multiply
   12,736.78x = 17,554.89 × 10,961.26
4. Step 4: Simplify right side
   12,736.78x = 192,423,710.78
5. Step 5: Solve for x
   x = 192,423,710.78/12,736.78
6. Step 6: Final answer
   x = 15,107.72