Finding the Fourth Proportional to 142,678.16, 196,888.83 and 78,147.68

Step by Step Solution

1. Step 1: Write the proportion equation
   142,678.16 : 196,888.83 = 78,147.68 : x
2. Step 2: Convert to fraction form
   142,678.16/196,888.83 = 78,147.68/x
3. Step 3: Cross multiply
   142,678.16x = 196,888.83 × 78,147.68
4. Step 4: Simplify right side
   142,678.16x = 15,386,405,218.04
5. Step 5: Solve for x
   x = 15,386,405,218.04/142,678.16
6. Step 6: Final answer
   x = 107,839.95