Finding the Fourth Proportional to 142,120.36, 196,025.83 and 91,147.87

Step by Step Solution

1. Step 1: Write the proportion equation
   142,120.36 : 196,025.83 = 91,147.87 : x
2. Step 2: Convert to fraction form
   142,120.36/196,025.83 = 91,147.87/x
3. Step 3: Cross multiply
   142,120.36x = 196,025.83 × 91,147.87
4. Step 4: Simplify right side
   142,120.36x = 17,867,336,869.48
5. Step 5: Solve for x
   x = 17,867,336,869.48/142,120.36
6. Step 6: Final answer
   x = 125,719.76