Finding the Fourth Proportional to 3,870.71, 5,806.90 and 1,273.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.71 : 5,806.90 = 1,273.55 : x
2. Step 2: Convert to fraction form
   3,870.71/5,806.90 = 1,273.55/x
3. Step 3: Cross multiply
   3,870.71x = 5,806.90 × 1,273.55
4. Step 4: Simplify right side
   3,870.71x = 7,395,348.46
5. Step 5: Solve for x
   x = 7,395,348.46/3,870.71
6. Step 6: Final answer
   x = 1,910.59