Finding the Fourth Proportional to 21,300.80, 29,395.23 and 12,353.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.80 : 29,395.23 = 12,353.61 : x
2. Step 2: Convert to fraction form
   21,300.80/29,395.23 = 12,353.61/x
3. Step 3: Cross multiply
   21,300.80x = 29,395.23 × 12,353.61
4. Step 4: Simplify right side
   21,300.80x = 363,137,207.28
5. Step 5: Solve for x
   x = 363,137,207.28/21,300.80
6. Step 6: Final answer
   x = 17,048.05