Finding the Fourth Proportional to 21,394.69, 29,510.76 and 13,429.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,394.69 : 29,510.76 = 13,429.96 : x
2. Step 2: Convert to fraction form
   21,394.69/29,510.76 = 13,429.96/x
3. Step 3: Cross multiply
   21,394.69x = 29,510.76 × 13,429.96
4. Step 4: Simplify right side
   21,394.69x = 396,328,326.37
5. Step 5: Solve for x
   x = 396,328,326.37/21,394.69
6. Step 6: Final answer
   x = 18,524.61