Finding the Fourth Proportional to 21,451.89, 29,603.57 and 13,068.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,451.89 : 29,603.57 = 13,068.39 : x
2. Step 2: Convert to fraction form
   21,451.89/29,603.57 = 13,068.39/x
3. Step 3: Cross multiply
   21,451.89x = 29,603.57 × 13,068.39
4. Step 4: Simplify right side
   21,451.89x = 386,870,998.15
5. Step 5: Solve for x
   x = 386,870,998.15/21,451.89
6. Step 6: Final answer
   x = 18,034.35