Finding the Fourth Proportional to 21,037.43, 29,028.50 and 12,085.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,037.43 : 29,028.50 = 12,085.31 : x
2. Step 2: Convert to fraction form
   21,037.43/29,028.50 = 12,085.31/x
3. Step 3: Cross multiply
   21,037.43x = 29,028.50 × 12,085.31
4. Step 4: Simplify right side
   21,037.43x = 350,818,360.91
5. Step 5: Solve for x
   x = 350,818,360.91/21,037.43
6. Step 6: Final answer
   x = 16,675.91