Finding the Fourth Proportional to 21,429.82, 32,149.86 and 8,942.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.82 : 32,149.86 = 8,942.90 : x
2. Step 2: Convert to fraction form
   21,429.82/32,149.86 = 8,942.90/x
3. Step 3: Cross multiply
   21,429.82x = 32,149.86 × 8,942.90
4. Step 4: Simplify right side
   21,429.82x = 287,512,822.24
5. Step 5: Solve for x
   x = 287,512,822.24/21,429.82
6. Step 6: Final answer
   x = 13,416.49