Finding the Fourth Proportional to 18,921.72, 26,111.98 and 10,538.22

Step by Step Solution

1. Step 1: Write the proportion equation
   18,921.72 : 26,111.98 = 10,538.22 : x
2. Step 2: Convert to fraction form
   18,921.72/26,111.98 = 10,538.22/x
3. Step 3: Cross multiply
   18,921.72x = 26,111.98 × 10,538.22
4. Step 4: Simplify right side
   18,921.72x = 275,173,789.88
5. Step 5: Solve for x
   x = 275,173,789.88/18,921.72
6. Step 6: Final answer
   x = 14,542.75