Finding the Fourth Proportional to 7,870.77, 10,854.41 and 5,179.41

Step by Step Solution

1. Step 1: Write the proportion equation
   7,870.77 : 10,854.41 = 5,179.41 : x
2. Step 2: Convert to fraction form
   7,870.77/10,854.41 = 5,179.41/x
3. Step 3: Cross multiply
   7,870.77x = 10,854.41 × 5,179.41
4. Step 4: Simplify right side
   7,870.77x = 56,219,413.80
5. Step 5: Solve for x
   x = 56,219,413.80/7,870.77
6. Step 6: Final answer
   x = 7,142.81