Finding the Fourth Proportional to 1,279.05, 1,764.96 and 719.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.05 : 1,764.96 = 719.47 : x
2. Step 2: Convert to fraction form
   1,279.05/1,764.96 = 719.47/x
3. Step 3: Cross multiply
   1,279.05x = 1,764.96 × 719.47
4. Step 4: Simplify right side
   1,279.05x = 1,269,835.77
5. Step 5: Solve for x
   x = 1,269,835.77/1,279.05
6. Step 6: Final answer
   x = 992.80