Finding the Fourth Proportional to 1,356.40, 1,871.76 and 767.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.40 : 1,871.76 = 767.04 : x
2. Step 2: Convert to fraction form
   1,356.40/1,871.76 = 767.04/x
3. Step 3: Cross multiply
   1,356.40x = 1,871.76 × 767.04
4. Step 4: Simplify right side
   1,356.40x = 1,435,714.79
5. Step 5: Solve for x
   x = 1,435,714.79/1,356.40
6. Step 6: Final answer
   x = 1,058.47