Finding the Fourth Proportional to 142,106.72, 196,108.64 and 78,443.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,106.72 : 196,108.64 = 78,443.15 : x
2. Step 2: Convert to fraction form
   142,106.72/196,108.64 = 78,443.15/x
3. Step 3: Cross multiply
   142,106.72x = 196,108.64 × 78,443.15
4. Step 4: Simplify right side
   142,106.72x = 15,383,378,091.06
5. Step 5: Solve for x
   x = 15,383,378,091.06/142,106.72
6. Step 6: Final answer
   x = 108,252.30