Finding the Fourth Proportional to 142,654.38, 196,860.63 and 78,990.81

Step by Step Solution

1. Step 1: Write the proportion equation
   142,654.38 : 196,860.63 = 78,990.81 : x
2. Step 2: Convert to fraction form
   142,654.38/196,860.63 = 78,990.81/x
3. Step 3: Cross multiply
   142,654.38x = 196,860.63 × 78,990.81
4. Step 4: Simplify right side
   142,654.38x = 15,550,180,620.81
5. Step 5: Solve for x
   x = 15,550,180,620.81/142,654.38
6. Step 6: Final answer
   x = 109,005.98