Finding the Fourth Proportional to 142,390.59, 196,481.83 and 78,719.73

Step by Step Solution

1. Step 1: Write the proportion equation
   142,390.59 : 196,481.83 = 78,719.73 : x
2. Step 2: Convert to fraction form
   142,390.59/196,481.83 = 78,719.73/x
3. Step 3: Cross multiply
   142,390.59x = 196,481.83 × 78,719.73
4. Step 4: Simplify right side
   142,390.59x = 15,466,996,607.51
5. Step 5: Solve for x
   x = 15,466,996,607.51/142,390.59
6. Step 6: Final answer
   x = 108,623.73