Finding the Fourth Proportional to 1,279.59, 1,765.69 and 719.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.59 : 1,765.69 = 719.93 : x
2. Step 2: Convert to fraction form
   1,279.59/1,765.69 = 719.93/x
3. Step 3: Cross multiply
   1,279.59x = 1,765.69 × 719.93
4. Step 4: Simplify right side
   1,279.59x = 1,271,162.57
5. Step 5: Solve for x
   x = 1,271,162.57/1,279.59
6. Step 6: Final answer
   x = 993.41