Finding the Fourth Proportional to 21,082.16, 29,093.23 and 12,131.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,082.16 : 29,093.23 = 12,131.39 : x
2. Step 2: Convert to fraction form
   21,082.16/29,093.23 = 12,131.39/x
3. Step 3: Cross multiply
   21,082.16x = 29,093.23 × 12,131.39
4. Step 4: Simplify right side
   21,082.16x = 352,941,319.49
5. Step 5: Solve for x
   x = 352,941,319.49/21,082.16
6. Step 6: Final answer
   x = 16,741.23