Finding the Fourth Proportional to 1,781.05, 2,670.89 and 712.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.05 : 2,670.89 = 712.16 : x
2. Step 2: Convert to fraction form
   1,781.05/2,670.89 = 712.16/x
3. Step 3: Cross multiply
   1,781.05x = 2,670.89 × 712.16
4. Step 4: Simplify right side
   1,781.05x = 1,902,086.78
5. Step 5: Solve for x
   x = 1,902,086.78/1,781.05
6. Step 6: Final answer
   x = 1,067.96