Finding the Fourth Proportional to 1,273.62, 1,758.12 and 776.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,273.62 : 1,758.12 = 776.42 : x
2. Step 2: Convert to fraction form
   1,273.62/1,758.12 = 776.42/x
3. Step 3: Cross multiply
   1,273.62x = 1,758.12 × 776.42
4. Step 4: Simplify right side
   1,273.62x = 1,365,039.53
5. Step 5: Solve for x
   x = 1,365,039.53/1,273.62
6. Step 6: Final answer
   x = 1,071.78