Finding the Fourth Proportional to 142,078.72, 196,058.04 and 81,649.48

Step by Step Solution

1. Step 1: Write the proportion equation
   142,078.72 : 196,058.04 = 81,649.48 : x
2. Step 2: Convert to fraction form
   142,078.72/196,058.04 = 81,649.48/x
3. Step 3: Cross multiply
   142,078.72x = 196,058.04 × 81,649.48
4. Step 4: Simplify right side
   142,078.72x = 16,008,037,015.82
5. Step 5: Solve for x
   x = 16,008,037,015.82/142,078.72
6. Step 6: Final answer
   x = 112,670.19