Finding the Fourth Proportional to 142,870.68, 197,163.81 and 78,345.79

Step by Step Solution

1. Step 1: Write the proportion equation
   142,870.68 : 197,163.81 = 78,345.79 : x
2. Step 2: Convert to fraction form
   142,870.68/197,163.81 = 78,345.79/x
3. Step 3: Cross multiply
   142,870.68x = 197,163.81 × 78,345.79
4. Step 4: Simplify right side
   142,870.68x = 15,446,954,453.86
5. Step 5: Solve for x
   x = 15,446,954,453.86/142,870.68
6. Step 6: Final answer
   x = 108,118.43