Finding the Fourth Proportional to 2,139.69, 3,209.52 and 1,709.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.69 : 3,209.52 = 1,709.58 : x
2. Step 2: Convert to fraction form
   2,139.69/3,209.52 = 1,709.58/x
3. Step 3: Cross multiply
   2,139.69x = 3,209.52 × 1,709.58
4. Step 4: Simplify right side
   2,139.69x = 5,486,931.20
5. Step 5: Solve for x
   x = 5,486,931.20/2,139.69
6. Step 6: Final answer
   x = 2,564.36