Finding the Fourth Proportional to 20,515.42, 30,830.84 and 12,196.93

Step by Step Solution

1. Step 1: Write the proportion equation
   20,515.42 : 30,830.84 = 12,196.93 : x
2. Step 2: Convert to fraction form
   20,515.42/30,830.84 = 12,196.93/x
3. Step 3: Cross multiply
   20,515.42x = 30,830.84 × 12,196.93
4. Step 4: Simplify right side
   20,515.42x = 376,041,597.32
5. Step 5: Solve for x
   x = 376,041,597.32/20,515.42
6. Step 6: Final answer
   x = 18,329.71