Finding the Fourth Proportional to 21,091.68, 29,105.37 and 12,603.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,091.68 : 29,105.37 = 12,603.42 : x
2. Step 2: Convert to fraction form
   21,091.68/29,105.37 = 12,603.42/x
3. Step 3: Cross multiply
   21,091.68x = 29,105.37 × 12,603.42
4. Step 4: Simplify right side
   21,091.68x = 366,827,202.37
5. Step 5: Solve for x
   x = 366,827,202.37/21,091.68
6. Step 6: Final answer
   x = 17,392.03