Finding the Fourth Proportional to 2,139.11, 3,209.69 and 969.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.11 : 3,209.69 = 969.94 : x
2. Step 2: Convert to fraction form
   2,139.11/3,209.69 = 969.94/x
3. Step 3: Cross multiply
   2,139.11x = 3,209.69 × 969.94
4. Step 4: Simplify right side
   2,139.11x = 3,113,206.72
5. Step 5: Solve for x
   x = 3,113,206.72/2,139.11
6. Step 6: Final answer
   x = 1,455.37