Finding the Fourth Proportional to 21,776, 30,053.60 and 12,944

Step by Step Solution

1. Step 1: Write the proportion equation
   21,776 : 30,053.60 = 12,944 : x
2. Step 2: Convert to fraction form
   21,776/30,053.60 = 12,944/x
3. Step 3: Cross multiply
   21,776x = 30,053.60 × 12,944
4. Step 4: Simplify right side
   21,776x = 389,013,798.40
5. Step 5: Solve for x
   x = 389,013,798.40/21,776
6. Step 6: Final answer
   x = 17,864.34