Finding the Fourth Proportional to 11,009.31, 16,516.67 and 5,159.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,009.31 : 16,516.67 = 5,159.09 : x
2. Step 2: Convert to fraction form
   11,009.31/16,516.67 = 5,159.09/x
3. Step 3: Cross multiply
   11,009.31x = 16,516.67 × 5,159.09
4. Step 4: Simplify right side
   11,009.31x = 85,210,878.65
5. Step 5: Solve for x
   x = 85,210,878.65/11,009.31
6. Step 6: Final answer
   x = 7,739.89