Finding the Fourth Proportional to 139,907.16, 209,864.38 and 46,413.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,907.16 : 209,864.38 = 46,413.72 : x
2. Step 2: Convert to fraction form
   139,907.16/209,864.38 = 46,413.72/x
3. Step 3: Cross multiply
   139,907.16x = 209,864.38 × 46,413.72
4. Step 4: Simplify right side
   139,907.16x = 9,740,586,571.29
5. Step 5: Solve for x
   x = 9,740,586,571.29/139,907.16
6. Step 6: Final answer
   x = 69,621.79