Finding the Fourth Proportional to 21,341.78, 29,451.72 and 11,910.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,341.78 : 29,451.72 = 11,910.98 : x
2. Step 2: Convert to fraction form
   21,341.78/29,451.72 = 11,910.98/x
3. Step 3: Cross multiply
   21,341.78x = 29,451.72 × 11,910.98
4. Step 4: Simplify right side
   21,341.78x = 350,798,847.89
5. Step 5: Solve for x
   x = 350,798,847.89/21,341.78
6. Step 6: Final answer
   x = 16,437.19