Finding the Fourth Proportional to 1,273.55, 1,757.81 and 776.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,273.55 : 1,757.81 = 776.46 : x
2. Step 2: Convert to fraction form
   1,273.55/1,757.81 = 776.46/x
3. Step 3: Cross multiply
   1,273.55x = 1,757.81 × 776.46
4. Step 4: Simplify right side
   1,273.55x = 1,364,877.69
5. Step 5: Solve for x
   x = 1,364,877.69/1,273.55
6. Step 6: Final answer
   x = 1,071.71