Finding the Fourth Proportional to 3,870.16, 5,805.64 and 1,679.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.16 : 5,805.64 = 1,679.10 : x
2. Step 2: Convert to fraction form
   3,870.16/5,805.64 = 1,679.10/x
3. Step 3: Cross multiply
   3,870.16x = 5,805.64 × 1,679.10
4. Step 4: Simplify right side
   3,870.16x = 9,748,250.12
5. Step 5: Solve for x
   x = 9,748,250.12/3,870.16
6. Step 6: Final answer
   x = 2,518.82