Finding the Fourth Proportional to 20,101.45, 27,736.42 and 12,138.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,101.45 : 27,736.42 = 12,138.34 : x
2. Step 2: Convert to fraction form
   20,101.45/27,736.42 = 12,138.34/x
3. Step 3: Cross multiply
   20,101.45x = 27,736.42 × 12,138.34
4. Step 4: Simplify right side
   20,101.45x = 336,674,096.34
5. Step 5: Solve for x
   x = 336,674,096.34/20,101.45
6. Step 6: Final answer
   x = 16,748.75