Finding the Fourth Proportional to 78,262.84, 117,392.28 and 42,758.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,262.84 : 117,392.28 = 42,758.65 : x
2. Step 2: Convert to fraction form
   78,262.84/117,392.28 = 42,758.65/x
3. Step 3: Cross multiply
   78,262.84x = 117,392.28 × 42,758.65
4. Step 4: Simplify right side
   78,262.84x = 5,019,535,413.22
5. Step 5: Solve for x
   x = 5,019,535,413.22/78,262.84
6. Step 6: Final answer
   x = 64,136.89