Finding the Fourth Proportional to 2,106.53, 3,159.72 and 719.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.53 : 3,159.72 = 719.91 : x
2. Step 2: Convert to fraction form
   2,106.53/3,159.72 = 719.91/x
3. Step 3: Cross multiply
   2,106.53x = 3,159.72 × 719.91
4. Step 4: Simplify right side
   2,106.53x = 2,274,714.03
5. Step 5: Solve for x
   x = 2,274,714.03/2,106.53
6. Step 6: Final answer
   x = 1,079.84