Finding the Fourth Proportional to 20,494.14, 30,728.89 and 13,900.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,494.14 : 30,728.89 = 13,900.34 : x
2. Step 2: Convert to fraction form
   20,494.14/30,728.89 = 13,900.34/x
3. Step 3: Cross multiply
   20,494.14x = 30,728.89 × 13,900.34
4. Step 4: Simplify right side
   20,494.14x = 427,142,018.82
5. Step 5: Solve for x
   x = 427,142,018.82/20,494.14
6. Step 6: Final answer
   x = 20,842.15