Finding the Fourth Proportional to 2,072.45, 2,860.25 and 1,286.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.45 : 2,860.25 = 1,286.62 : x
2. Step 2: Convert to fraction form
   2,072.45/2,860.25 = 1,286.62/x
3. Step 3: Cross multiply
   2,072.45x = 2,860.25 × 1,286.62
4. Step 4: Simplify right side
   2,072.45x = 3,680,041.27
5. Step 5: Solve for x
   x = 3,680,041.27/2,072.45
6. Step 6: Final answer
   x = 1,775.69