Finding the Fourth Proportional to 20,238.35, 27,910.71 and 12,685.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,238.35 : 27,910.71 = 12,685.46 : x
2. Step 2: Convert to fraction form
   20,238.35/27,910.71 = 12,685.46/x
3. Step 3: Cross multiply
   20,238.35x = 27,910.71 × 12,685.46
4. Step 4: Simplify right side
   20,238.35x = 354,060,055.72
5. Step 5: Solve for x
   x = 354,060,055.72/20,238.35
6. Step 6: Final answer
   x = 17,494.52