Finding the Fourth Proportional to 1,379.82, 2,066.53 and 830.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.82 : 2,066.53 = 830.79 : x
2. Step 2: Convert to fraction form
   1,379.82/2,066.53 = 830.79/x
3. Step 3: Cross multiply
   1,379.82x = 2,066.53 × 830.79
4. Step 4: Simplify right side
   1,379.82x = 1,716,849.37
5. Step 5: Solve for x
   x = 1,716,849.37/1,379.82
6. Step 6: Final answer
   x = 1,244.26