Finding the Fourth Proportional to 20,097.42, 30,141.78 and 12,691.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,097.42 : 30,141.78 = 12,691.98 : x
2. Step 2: Convert to fraction form
   20,097.42/30,141.78 = 12,691.98/x
3. Step 3: Cross multiply
   20,097.42x = 30,141.78 × 12,691.98
4. Step 4: Simplify right side
   20,097.42x = 382,558,868.92
5. Step 5: Solve for x
   x = 382,558,868.92/20,097.42
6. Step 6: Final answer
   x = 19,035.22