Finding the Fourth Proportional to 105,292.78, 145,304.04 and 57,546.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,292.78 : 145,304.04 = 57,546.12 : x
2. Step 2: Convert to fraction form
   105,292.78/145,304.04 = 57,546.12/x
3. Step 3: Cross multiply
   105,292.78x = 145,304.04 × 57,546.12
4. Step 4: Simplify right side
   105,292.78x = 8,361,683,722.32
5. Step 5: Solve for x
   x = 8,361,683,722.32/105,292.78
6. Step 6: Final answer
   x = 79,413.65