Finding the Fourth Proportional to 1,215.48, 1,677.42 and 773.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.48 : 1,677.42 = 773.46 : x
2. Step 2: Convert to fraction form
   1,215.48/1,677.42 = 773.46/x
3. Step 3: Cross multiply
   1,215.48x = 1,677.42 × 773.46
4. Step 4: Simplify right side
   1,215.48x = 1,297,417.27
5. Step 5: Solve for x
   x = 1,297,417.27/1,215.48
6. Step 6: Final answer
   x = 1,067.41