Finding the Fourth Proportional to 142,636.75, 196,841.73 and 78,108.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,636.75 : 196,841.73 = 78,108.72 : x
2. Step 2: Convert to fraction form
   142,636.75/196,841.73 = 78,108.72/x
3. Step 3: Cross multiply
   142,636.75x = 196,841.73 × 78,108.72
4. Step 4: Simplify right side
   142,636.75x = 15,375,055,572.89
5. Step 5: Solve for x
   x = 15,375,055,572.89/142,636.75
6. Step 6: Final answer
   x = 107,791.68