Finding the Fourth Proportional to 21,936.83, 30,272.83 and 12,378.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,936.83 : 30,272.83 = 12,378.74 : x
2. Step 2: Convert to fraction form
   21,936.83/30,272.83 = 12,378.74/x
3. Step 3: Cross multiply
   21,936.83x = 30,272.83 × 12,378.74
4. Step 4: Simplify right side
   21,936.83x = 374,739,536.37
5. Step 5: Solve for x
   x = 374,739,536.37/21,936.83
6. Step 6: Final answer
   x = 17,082.66