Finding the Fourth Proportional to 11,356.10, 17,007.71 and 10,961.90

Step by Step Solution

1. Step 1: Write the proportion equation
   11,356.10 : 17,007.71 = 10,961.90 : x
2. Step 2: Convert to fraction form
   11,356.10/17,007.71 = 10,961.90/x
3. Step 3: Cross multiply
   11,356.10x = 17,007.71 × 10,961.90
4. Step 4: Simplify right side
   11,356.10x = 186,436,676.40
5. Step 5: Solve for x
   x = 186,436,676.40/11,356.10
6. Step 6: Final answer
   x = 16,417.32