Finding the Fourth Proportional to 21,093.50, 29,108.13 and 12,141.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.50 : 29,108.13 = 12,141.30 : x
2. Step 2: Convert to fraction form
   21,093.50/29,108.13 = 12,141.30/x
3. Step 3: Cross multiply
   21,093.50x = 29,108.13 × 12,141.30
4. Step 4: Simplify right side
   21,093.50x = 353,410,538.77
5. Step 5: Solve for x
   x = 353,410,538.77/21,093.50
6. Step 6: Final answer
   x = 16,754.48