Finding the Fourth Proportional to 142,131.72, 196,136.52 and 78,468.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,131.72 : 196,136.52 = 78,468.12 : x
2. Step 2: Convert to fraction form
   142,131.72/196,136.52 = 78,468.12/x
3. Step 3: Cross multiply
   142,131.72x = 196,136.52 × 78,468.12
4. Step 4: Simplify right side
   142,131.72x = 15,390,463,987.74
5. Step 5: Solve for x
   x = 15,390,463,987.74/142,131.72
6. Step 6: Final answer
   x = 108,283.11