Finding the Fourth Proportional to 143,007.78, 197,350.20 and 78,478.10

Step by Step Solution

1. Step 1: Write the proportion equation
   143,007.78 : 197,350.20 = 78,478.10 : x
2. Step 2: Convert to fraction form
   143,007.78/197,350.20 = 78,478.10/x
3. Step 3: Cross multiply
   143,007.78x = 197,350.20 × 78,478.10
4. Step 4: Simplify right side
   143,007.78x = 15,487,667,743.87
5. Step 5: Solve for x
   x = 15,487,667,743.87/143,007.78
6. Step 6: Final answer
   x = 108,299.48