Finding the Fourth Proportional to 2,139.16, 3,208.42 and 1,776.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.16 : 3,208.42 = 1,776.28 : x
2. Step 2: Convert to fraction form
   2,139.16/3,208.42 = 1,776.28/x
3. Step 3: Cross multiply
   2,139.16x = 3,208.42 × 1,776.28
4. Step 4: Simplify right side
   2,139.16x = 5,699,052.28
5. Step 5: Solve for x
   x = 5,699,052.28/2,139.16
6. Step 6: Final answer
   x = 2,664.15