Finding the Fourth Proportional to 142,066.63, 196,046.22 and 78,403.60

Step by Step Solution

1. Step 1: Write the proportion equation
   142,066.63 : 196,046.22 = 78,403.60 : x
2. Step 2: Convert to fraction form
   142,066.63/196,046.22 = 78,403.60/x
3. Step 3: Cross multiply
   142,066.63x = 196,046.22 × 78,403.60
4. Step 4: Simplify right side
   142,066.63x = 15,370,729,414.39
5. Step 5: Solve for x
   x = 15,370,729,414.39/142,066.63
6. Step 6: Final answer
   x = 108,193.81