Finding the Fourth Proportional to 1,248.69, 1,722.89 and 776.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.69 : 1,722.89 = 776.37 : x
2. Step 2: Convert to fraction form
   1,248.69/1,722.89 = 776.37/x
3. Step 3: Cross multiply
   1,248.69x = 1,722.89 × 776.37
4. Step 4: Simplify right side
   1,248.69x = 1,337,596.23
5. Step 5: Solve for x
   x = 1,337,596.23/1,248.69
6. Step 6: Final answer
   x = 1,071.20