Finding the Fourth Proportional to 128,290.83, 192,467.52 and 90,413.94

Step by Step Solution

1. Step 1: Write the proportion equation
   128,290.83 : 192,467.52 = 90,413.94 : x
2. Step 2: Convert to fraction form
   128,290.83/192,467.52 = 90,413.94/x
3. Step 3: Cross multiply
   128,290.83x = 192,467.52 × 90,413.94
4. Step 4: Simplify right side
   128,290.83x = 17,401,746,805.23
5. Step 5: Solve for x
   x = 17,401,746,805.23/128,290.83
6. Step 6: Final answer
   x = 135,642.95