Finding the Fourth Proportional to 1,367.99, 1,888.17 and 778.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.99 : 1,888.17 = 778.72 : x
2. Step 2: Convert to fraction form
   1,367.99/1,888.17 = 778.72/x
3. Step 3: Cross multiply
   1,367.99x = 1,888.17 × 778.72
4. Step 4: Simplify right side
   1,367.99x = 1,470,346.30
5. Step 5: Solve for x
   x = 1,470,346.30/1,367.99
6. Step 6: Final answer
   x = 1,074.82