Finding the Fourth Proportional to 142,408.79, 196,431.50 and 91,340.60

Step by Step Solution

1. Step 1: Write the proportion equation
   142,408.79 : 196,431.50 = 91,340.60 : x
2. Step 2: Convert to fraction form
   142,408.79/196,431.50 = 91,340.60/x
3. Step 3: Cross multiply
   142,408.79x = 196,431.50 × 91,340.60
4. Step 4: Simplify right side
   142,408.79x = 17,942,169,630.04
5. Step 5: Solve for x
   x = 17,942,169,630.04/142,408.79
6. Step 6: Final answer
   x = 125,990.61