Finding the Fourth Proportional to 142,138.89, 196,154.73 and 78,480.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,138.89 : 196,154.73 = 78,480.72 : x
2. Step 2: Convert to fraction form
   142,138.89/196,154.73 = 78,480.72/x
3. Step 3: Cross multiply
   142,138.89x = 196,154.73 × 78,480.72
4. Step 4: Simplify right side
   142,138.89x = 15,394,364,441.81
5. Step 5: Solve for x
   x = 15,394,364,441.81/142,138.89
6. Step 6: Final answer
   x = 108,305.08