Finding the Fourth Proportional to 142,399.31, 196,514.98 and 78,739.38

Step by Step Solution

1. Step 1: Write the proportion equation
   142,399.31 : 196,514.98 = 78,739.38 : x
2. Step 2: Convert to fraction form
   142,399.31/196,514.98 = 78,739.38/x
3. Step 3: Cross multiply
   142,399.31x = 196,514.98 × 78,739.38
4. Step 4: Simplify right side
   142,399.31x = 15,473,467,489.06
5. Step 5: Solve for x
   x = 15,473,467,489.06/142,399.31
6. Step 6: Final answer
   x = 108,662.52