Finding the Fourth Proportional to 142,694.09, 196,915.69 and 78,162.81

Step by Step Solution

1. Step 1: Write the proportion equation
   142,694.09 : 196,915.69 = 78,162.81 : x
2. Step 2: Convert to fraction form
   142,694.09/196,915.69 = 78,162.81/x
3. Step 3: Cross multiply
   142,694.09x = 196,915.69 × 78,162.81
4. Step 4: Simplify right side
   142,694.09x = 15,391,483,441.31
5. Step 5: Solve for x
   x = 15,391,483,441.31/142,694.09
6. Step 6: Final answer
   x = 107,863.50