Finding the Fourth Proportional to 142,439.69, 196,558.78 and 77,896.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,439.69 : 196,558.78 = 77,896.10 : x
2. Step 2: Convert to fraction form
   142,439.69/196,558.78 = 77,896.10/x
3. Step 3: Cross multiply
   142,439.69x = 196,558.78 × 77,896.10
4. Step 4: Simplify right side
   142,439.69x = 15,311,162,382.76
5. Step 5: Solve for x
   x = 15,311,162,382.76/142,439.69
6. Step 6: Final answer
   x = 107,492.25