Finding the Fourth Proportional to 142,591.78, 196,774.27 and 78,928.21

Step by Step Solution

1. Step 1: Write the proportion equation
   142,591.78 : 196,774.27 = 78,928.21 : x
2. Step 2: Convert to fraction form
   142,591.78/196,774.27 = 78,928.21/x
3. Step 3: Cross multiply
   142,591.78x = 196,774.27 × 78,928.21
4. Step 4: Simplify right side
   142,591.78x = 15,531,040,905.16
5. Step 5: Solve for x
   x = 15,531,040,905.16/142,591.78
6. Step 6: Final answer
   x = 108,919.61