Finding the Fourth Proportional to 20,796.56, 28,699.82 and 12,730.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.56 : 28,699.82 = 12,730.05 : x
2. Step 2: Convert to fraction form
   20,796.56/28,699.82 = 12,730.05/x
3. Step 3: Cross multiply
   20,796.56x = 28,699.82 × 12,730.05
4. Step 4: Simplify right side
   20,796.56x = 365,350,143.59
5. Step 5: Solve for x
   x = 365,350,143.59/20,796.56
6. Step 6: Final answer
   x = 17,567.82