Finding the Fourth Proportional to 78,221.38, 107,944.50 and 42,411.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,221.38 : 107,944.50 = 42,411.28 : x
2. Step 2: Convert to fraction form
   78,221.38/107,944.50 = 42,411.28/x
3. Step 3: Cross multiply
   78,221.38x = 107,944.50 × 42,411.28
4. Step 4: Simplify right side
   78,221.38x = 4,578,064,413.96
5. Step 5: Solve for x
   x = 4,578,064,413.96/78,221.38
6. Step 6: Final answer
   x = 58,527.02