Finding the Fourth Proportional to 20,436.12, 30,693.06 and 12,699

Step by Step Solution

1. Step 1: Write the proportion equation
   20,436.12 : 30,693.06 = 12,699 : x
2. Step 2: Convert to fraction form
   20,436.12/30,693.06 = 12,699/x
3. Step 3: Cross multiply
   20,436.12x = 30,693.06 × 12,699
4. Step 4: Simplify right side
   20,436.12x = 389,771,168.94
5. Step 5: Solve for x
   x = 389,771,168.94/20,436.12
6. Step 6: Final answer
   x = 19,072.66