Finding the Fourth Proportional to 3,870.59, 5,806.89 and 1,679.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.59 : 5,806.89 = 1,679.74 : x
2. Step 2: Convert to fraction form
   3,870.59/5,806.89 = 1,679.74/x
3. Step 3: Cross multiply
   3,870.59x = 5,806.89 × 1,679.74
4. Step 4: Simplify right side
   3,870.59x = 9,754,050.89
5. Step 5: Solve for x
   x = 9,754,050.89/3,870.59
6. Step 6: Final answer
   x = 2,520.05