Finding the Fourth Proportional to 142,451.55, 196,588.28 and 78,789.80

Step by Step Solution

1. Step 1: Write the proportion equation
   142,451.55 : 196,588.28 = 78,789.80 : x
2. Step 2: Convert to fraction form
   142,451.55/196,588.28 = 78,789.80/x
3. Step 3: Cross multiply
   142,451.55x = 196,588.28 × 78,789.80
4. Step 4: Simplify right side
   142,451.55x = 15,489,150,869.60
5. Step 5: Solve for x
   x = 15,489,150,869.60/142,451.55
6. Step 6: Final answer
   x = 108,732.76