Finding the Fourth Proportional to 2,870.67, 4,271.67 and 2,860.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.67 : 4,271.67 = 2,860.95 : x
2. Step 2: Convert to fraction form
   2,870.67/4,271.67 = 2,860.95/x
3. Step 3: Cross multiply
   2,870.67x = 4,271.67 × 2,860.95
4. Step 4: Simplify right side
   2,870.67x = 12,221,034.29
5. Step 5: Solve for x
   x = 12,221,034.29/2,870.67
6. Step 6: Final answer
   x = 4,257.21