Finding the Fourth Proportional to 1,367.12, 1,886.38 and 777.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.12 : 1,886.38 = 777.55 : x
2. Step 2: Convert to fraction form
   1,367.12/1,886.38 = 777.55/x
3. Step 3: Cross multiply
   1,367.12x = 1,886.38 × 777.55
4. Step 4: Simplify right side
   1,367.12x = 1,466,754.77
5. Step 5: Solve for x
   x = 1,466,754.77/1,367.12
6. Step 6: Final answer
   x = 1,072.88