Finding the Fourth Proportional to 142,046.36, 196,035.03 and 81,638.07

Step by Step Solution

1. Step 1: Write the proportion equation
   142,046.36 : 196,035.03 = 81,638.07 : x
2. Step 2: Convert to fraction form
   142,046.36/196,035.03 = 81,638.07/x
3. Step 3: Cross multiply
   142,046.36x = 196,035.03 × 81,638.07
4. Step 4: Simplify right side
   142,046.36x = 16,003,921,501.59
5. Step 5: Solve for x
   x = 16,003,921,501.59/142,046.36
6. Step 6: Final answer
   x = 112,666.89