Finding the Fourth Proportional to 143,648.82, 198,231.31 and 78,236.16

Step by Step Solution

1. Step 1: Write the proportion equation
   143,648.82 : 198,231.31 = 78,236.16 : x
2. Step 2: Convert to fraction form
   143,648.82/198,231.31 = 78,236.16/x
3. Step 3: Cross multiply
   143,648.82x = 198,231.31 × 78,236.16
4. Step 4: Simplify right side
   143,648.82x = 15,508,856,290.58
5. Step 5: Solve for x
   x = 15,508,856,290.58/143,648.82
6. Step 6: Final answer
   x = 107,963.69