Finding the Fourth Proportional to 21,985.29, 30,339.81 and 12,294.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,985.29 : 30,339.81 = 12,294.72 : x
2. Step 2: Convert to fraction form
   21,985.29/30,339.81 = 12,294.72/x
3. Step 3: Cross multiply
   21,985.29x = 30,339.81 × 12,294.72
4. Step 4: Simplify right side
   21,985.29x = 373,019,468.80
5. Step 5: Solve for x
   x = 373,019,468.80/21,985.29
6. Step 6: Final answer
   x = 16,966.78