Finding the Fourth Proportional to 20,111.51, 27,753.89 and 11,159

Step by Step Solution

1. Step 1: Write the proportion equation
   20,111.51 : 27,753.89 = 11,159 : x
2. Step 2: Convert to fraction form
   20,111.51/27,753.89 = 11,159/x
3. Step 3: Cross multiply
   20,111.51x = 27,753.89 × 11,159
4. Step 4: Simplify right side
   20,111.51x = 309,705,658.51
5. Step 5: Solve for x
   x = 309,705,658.51/20,111.51
6. Step 6: Final answer
   x = 15,399.42