Finding the Fourth Proportional to 2,106.39, 2,906.73 and 1,209.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.39 : 2,906.73 = 1,209.86 : x
2. Step 2: Convert to fraction form
   2,106.39/2,906.73 = 1,209.86/x
3. Step 3: Cross multiply
   2,106.39x = 2,906.73 × 1,209.86
4. Step 4: Simplify right side
   2,106.39x = 3,516,721.82
5. Step 5: Solve for x
   x = 3,516,721.82/2,106.39
6. Step 6: Final answer
   x = 1,669.55