Finding the Fourth Proportional to 142,606.20, 196,734.78 and 85,986.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,606.20 : 196,734.78 = 85,986.12 : x
2. Step 2: Convert to fraction form
   142,606.20/196,734.78 = 85,986.12/x
3. Step 3: Cross multiply
   142,606.20x = 196,734.78 × 85,986.12
4. Step 4: Simplify right side
   142,606.20x = 16,916,460,401.25
5. Step 5: Solve for x
   x = 16,916,460,401.25/142,606.20
6. Step 6: Final answer
   x = 118,623.60