Finding the Fourth Proportional to 89,413.45, 123,390.31 and 49,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89,413.45 : 123,390.31 = 49,128.10 : x
2. Step 2: Convert to fraction form
   89,413.45/123,390.31 = 49,128.10/x
3. Step 3: Cross multiply
   89,413.45x = 123,390.31 × 49,128.10
4. Step 4: Simplify right side
   89,413.45x = 6,061,931,488.71
5. Step 5: Solve for x
   x = 6,061,931,488.71/89,413.45
6. Step 6: Final answer
   x = 67,796.64