Finding the Fourth Proportional to 142,054.20, 196,099.31 and 91,086.17

Step by Step Solution

1. Step 1: Write the proportion equation
   142,054.20 : 196,099.31 = 91,086.17 : x
2. Step 2: Convert to fraction form
   142,054.20/196,099.31 = 91,086.17/x
3. Step 3: Cross multiply
   142,054.20x = 196,099.31 × 91,086.17
4. Step 4: Simplify right side
   142,054.20x = 17,861,934,334.76
5. Step 5: Solve for x
   x = 17,861,934,334.76/142,054.20
6. Step 6: Final answer
   x = 125,740.28