Finding the Fourth Proportional to 2,308.06, 3,189.28 and 1,643.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.06 : 3,189.28 = 1,643.76 : x
2. Step 2: Convert to fraction form
   2,308.06/3,189.28 = 1,643.76/x
3. Step 3: Cross multiply
   2,308.06x = 3,189.28 × 1,643.76
4. Step 4: Simplify right side
   2,308.06x = 5,242,399.06
5. Step 5: Solve for x
   x = 5,242,399.06/2,308.06
6. Step 6: Final answer
   x = 2,271.35