Finding the Fourth Proportional to 142,638.63, 196,847.46 and 78,976.43

Step by Step Solution

1. Step 1: Write the proportion equation
   142,638.63 : 196,847.46 = 78,976.43 : x
2. Step 2: Convert to fraction form
   142,638.63/196,847.46 = 78,976.43/x
3. Step 3: Cross multiply
   142,638.63x = 196,847.46 × 78,976.43
4. Step 4: Simplify right side
   142,638.63x = 15,546,310,137.49
5. Step 5: Solve for x
   x = 15,546,310,137.49/142,638.63
6. Step 6: Final answer
   x = 108,990.88