Finding the Fourth Proportional to 142,775.49, 197,025.89 and 78,243.94

Step by Step Solution

1. Step 1: Write the proportion equation
   142,775.49 : 197,025.89 = 78,243.94 : x
2. Step 2: Convert to fraction form
   142,775.49/197,025.89 = 78,243.94/x
3. Step 3: Cross multiply
   142,775.49x = 197,025.89 × 78,243.94
4. Step 4: Simplify right side
   142,775.49x = 15,416,081,770.67
5. Step 5: Solve for x
   x = 15,416,081,770.67/142,775.49
6. Step 6: Final answer
   x = 107,974.28