Finding the Fourth Proportional to 21,443.05, 29,592.98 and 12,947.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,443.05 : 29,592.98 = 12,947.23 : x
2. Step 2: Convert to fraction form
   21,443.05/29,592.98 = 12,947.23/x
3. Step 3: Cross multiply
   21,443.05x = 29,592.98 × 12,947.23
4. Step 4: Simplify right side
   21,443.05x = 383,147,118.45
5. Step 5: Solve for x
   x = 383,147,118.45/21,443.05
6. Step 6: Final answer
   x = 17,868.13