Finding the Fourth Proportional to 128,942.10, 193,413.15 and 89,576.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,942.10 : 193,413.15 = 89,576.10 : x
2. Step 2: Convert to fraction form
   128,942.10/193,413.15 = 89,576.10/x
3. Step 3: Cross multiply
   128,942.10x = 193,413.15 × 89,576.10
4. Step 4: Simplify right side
   128,942.10x = 17,325,195,665.72
5. Step 5: Solve for x
   x = 17,325,195,665.72/128,942.10
6. Step 6: Final answer
   x = 134,364.15