Finding the Fourth Proportional to 19,680.82, 27,158.55 and 10,728.31

Step by Step Solution

1. Step 1: Write the proportion equation
   19,680.82 : 27,158.55 = 10,728.31 : x
2. Step 2: Convert to fraction form
   19,680.82/27,158.55 = 10,728.31/x
3. Step 3: Cross multiply
   19,680.82x = 27,158.55 × 10,728.31
4. Step 4: Simplify right side
   19,680.82x = 291,365,343.55
5. Step 5: Solve for x
   x = 291,365,343.55/19,680.82
6. Step 6: Final answer
   x = 14,804.53