Finding the Fourth Proportional to 21,673.58, 29,902.52 and 12,723.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,673.58 : 29,902.52 = 12,723.28 : x
2. Step 2: Convert to fraction form
   21,673.58/29,902.52 = 12,723.28/x
3. Step 3: Cross multiply
   21,673.58x = 29,902.52 × 12,723.28
4. Step 4: Simplify right side
   21,673.58x = 380,458,020.15
5. Step 5: Solve for x
   x = 380,458,020.15/21,673.58
6. Step 6: Final answer
   x = 17,554.00