Finding the Fourth Proportional to 2,106.35, 3,159.86 and 719.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.35 : 3,159.86 = 719.76 : x
2. Step 2: Convert to fraction form
   2,106.35/3,159.86 = 719.76/x
3. Step 3: Cross multiply
   2,106.35x = 3,159.86 × 719.76
4. Step 4: Simplify right side
   2,106.35x = 2,274,340.83
5. Step 5: Solve for x
   x = 2,274,340.83/2,106.35
6. Step 6: Final answer
   x = 1,079.75