Finding the Fourth Proportional to 2,106.24, 2,906.88 and 1,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.24 : 2,906.88 = 1,278.72 : x
2. Step 2: Convert to fraction form
   2,106.24/2,906.88 = 1,278.72/x
3. Step 3: Cross multiply
   2,106.24x = 2,906.88 × 1,278.72
4. Step 4: Simplify right side
   2,106.24x = 3,717,085.59
5. Step 5: Solve for x
   x = 3,717,085.59/2,106.24
6. Step 6: Final answer
   x = 1,764.80