Finding the Fourth Proportional to 19,016.42, 28,531.39 and 8,485.48

Step by Step Solution

1. Step 1: Write the proportion equation
   19,016.42 : 28,531.39 = 8,485.48 : x
2. Step 2: Convert to fraction form
   19,016.42/28,531.39 = 8,485.48/x
3. Step 3: Cross multiply
   19,016.42x = 28,531.39 × 8,485.48
4. Step 4: Simplify right side
   19,016.42x = 242,102,649.82
5. Step 5: Solve for x
   x = 242,102,649.82/19,016.42
6. Step 6: Final answer
   x = 12,731.24