Finding the Fourth Proportional to 2,069.78, 3,106.22 and 1,290.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.78 : 3,106.22 = 1,290.92 : x
2. Step 2: Convert to fraction form
   2,069.78/3,106.22 = 1,290.92/x
3. Step 3: Cross multiply
   2,069.78x = 3,106.22 × 1,290.92
4. Step 4: Simplify right side
   2,069.78x = 4,009,859.54
5. Step 5: Solve for x
   x = 4,009,859.54/2,069.78
6. Step 6: Final answer
   x = 1,937.34