Finding the Fourth Proportional to 11,011.06, 16,513.89 and 5,161.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,011.06 : 16,513.89 = 5,161.78 : x
2. Step 2: Convert to fraction form
   11,011.06/16,513.89 = 5,161.78/x
3. Step 3: Cross multiply
   11,011.06x = 16,513.89 × 5,161.78
4. Step 4: Simplify right side
   11,011.06x = 85,241,067.12
5. Step 5: Solve for x
   x = 85,241,067.12/11,011.06
6. Step 6: Final answer
   x = 7,741.40