Finding the Fourth Proportional to 20,895.98, 28,820.16 and 12,942.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,895.98 : 28,820.16 = 12,942.62 : x
2. Step 2: Convert to fraction form
   20,895.98/28,820.16 = 12,942.62/x
3. Step 3: Cross multiply
   20,895.98x = 28,820.16 × 12,942.62
4. Step 4: Simplify right side
   20,895.98x = 373,008,379.22
5. Step 5: Solve for x
   x = 373,008,379.22/20,895.98
6. Step 6: Final answer
   x = 17,850.72