Finding the Fourth Proportional to 20,770.12, 31,162.47 and 12,969.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,770.12 : 31,162.47 = 12,969.82 : x
2. Step 2: Convert to fraction form
   20,770.12/31,162.47 = 12,969.82/x
3. Step 3: Cross multiply
   20,770.12x = 31,162.47 × 12,969.82
4. Step 4: Simplify right side
   20,770.12x = 404,171,689.93
5. Step 5: Solve for x
   x = 404,171,689.93/20,770.12
6. Step 6: Final answer
   x = 19,459.28