Finding the Fourth Proportional to 1,379.43, 2,066.55 and 685.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.43 : 2,066.55 = 685.29 : x
2. Step 2: Convert to fraction form
   1,379.43/2,066.55 = 685.29/x
3. Step 3: Cross multiply
   1,379.43x = 2,066.55 × 685.29
4. Step 4: Simplify right side
   1,379.43x = 1,416,191.23
5. Step 5: Solve for x
   x = 1,416,191.23/1,379.43
6. Step 6: Final answer
   x = 1,026.65