Finding the Fourth Proportional to 21,105.23, 31,663.60 and 7,067.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.23 : 31,663.60 = 7,067.57 : x
2. Step 2: Convert to fraction form
   21,105.23/31,663.60 = 7,067.57/x
3. Step 3: Cross multiply
   21,105.23x = 31,663.60 × 7,067.57
4. Step 4: Simplify right side
   21,105.23x = 223,784,533.47
5. Step 5: Solve for x
   x = 223,784,533.47/21,105.23
6. Step 6: Final answer
   x = 10,603.28