Finding the Fourth Proportional to 142,380.20, 196,488.63 and 78,722.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,380.20 : 196,488.63 = 78,722.10 : x
2. Step 2: Convert to fraction form
   142,380.20/196,488.63 = 78,722.10/x
3. Step 3: Cross multiply
   142,380.20x = 196,488.63 × 78,722.10
4. Step 4: Simplify right side
   142,380.20x = 15,467,997,579.72
5. Step 5: Solve for x
   x = 15,467,997,579.72/142,380.20
6. Step 6: Final answer
   x = 108,638.69