Finding the Fourth Proportional to 142,698.79, 196,925.78 and 86,099.23

Step by Step Solution

1. Step 1: Write the proportion equation
   142,698.79 : 196,925.78 = 86,099.23 : x
2. Step 2: Convert to fraction form
   142,698.79/196,925.78 = 86,099.23/x
3. Step 3: Cross multiply
   142,698.79x = 196,925.78 × 86,099.23
4. Step 4: Simplify right side
   142,698.79x = 16,955,158,025.15
5. Step 5: Solve for x
   x = 16,955,158,025.15/142,698.79
6. Step 6: Final answer
   x = 118,817.81