Finding the Fourth Proportional to 142,581.66, 196,760.30 and 78,918.09

Step by Step Solution

1. Step 1: Write the proportion equation
   142,581.66 : 196,760.30 = 78,918.09 : x
2. Step 2: Convert to fraction form
   142,581.66/196,760.30 = 78,918.09/x
3. Step 3: Cross multiply
   142,581.66x = 196,760.30 × 78,918.09
4. Step 4: Simplify right side
   142,581.66x = 15,527,947,063.83
5. Step 5: Solve for x
   x = 15,527,947,063.83/142,581.66
6. Step 6: Final answer
   x = 108,905.64