Finding the Fourth Proportional to 21,778, 30,056.36 and 12,946

Step by Step Solution

1. Step 1: Write the proportion equation
   21,778 : 30,056.36 = 12,946 : x
2. Step 2: Convert to fraction form
   21,778/30,056.36 = 12,946/x
3. Step 3: Cross multiply
   21,778x = 30,056.36 × 12,946
4. Step 4: Simplify right side
   21,778x = 389,109,636.56
5. Step 5: Solve for x
   x = 389,109,636.56/21,778
6. Step 6: Final answer
   x = 17,867.10