Finding the Fourth Proportional to 108,119.67, 149,349.20 and 86,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   108,119.67 : 149,349.20 = 86,978.67 : x
2. Step 2: Convert to fraction form
   108,119.67/149,349.20 = 86,978.67/x
3. Step 3: Cross multiply
   108,119.67x = 149,349.20 × 86,978.67
4. Step 4: Simplify right side
   108,119.67x = 12,990,194,346.67
5. Step 5: Solve for x
   x = 12,990,194,346.67/108,119.67
6. Step 6: Final answer
   x = 120,146.45