Finding the Fourth Proportional to 21,105.77, 29,117.17 and 13,945.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.77 : 29,117.17 = 13,945.47 : x
2. Step 2: Convert to fraction form
   21,105.77/29,117.17 = 13,945.47/x
3. Step 3: Cross multiply
   21,105.77x = 29,117.17 × 13,945.47
4. Step 4: Simplify right side
   21,105.77x = 406,052,528.96
5. Step 5: Solve for x
   x = 406,052,528.96/21,105.77
6. Step 6: Final answer
   x = 19,238.94