Finding the Fourth Proportional to 21,491.39, 29,677.02 and 13,438.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,491.39 : 29,677.02 = 13,438.83 : x
2. Step 2: Convert to fraction form
   21,491.39/29,677.02 = 13,438.83/x
3. Step 3: Cross multiply
   21,491.39x = 29,677.02 × 13,438.83
4. Step 4: Simplify right side
   21,491.39x = 398,824,426.69
5. Step 5: Solve for x
   x = 398,824,426.69/21,491.39
6. Step 6: Final answer
   x = 18,557.41