Finding the Fourth Proportional to 2,139.62, 2,952.68 and 1,208.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.62 : 2,952.68 = 1,208.12 : x
2. Step 2: Convert to fraction form
   2,139.62/2,952.68 = 1,208.12/x
3. Step 3: Cross multiply
   2,139.62x = 2,952.68 × 1,208.12
4. Step 4: Simplify right side
   2,139.62x = 3,567,191.76
5. Step 5: Solve for x
   x = 3,567,191.76/2,139.62
6. Step 6: Final answer
   x = 1,667.21