Finding the Fourth Proportional to 21,478.06, 29,639.37 and 12,046.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,478.06 : 29,639.37 = 12,046.42 : x
2. Step 2: Convert to fraction form
   21,478.06/29,639.37 = 12,046.42/x
3. Step 3: Cross multiply
   21,478.06x = 29,639.37 × 12,046.42
4. Step 4: Simplify right side
   21,478.06x = 357,048,314.02
5. Step 5: Solve for x
   x = 357,048,314.02/21,478.06
6. Step 6: Final answer
   x = 16,623.86