Finding the Fourth Proportional to 1,367.31, 1,886.89 and 777.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.31 : 1,886.89 = 777.86 : x
2. Step 2: Convert to fraction form
   1,367.31/1,886.89 = 777.86/x
3. Step 3: Cross multiply
   1,367.31x = 1,886.89 × 777.86
4. Step 4: Simplify right side
   1,367.31x = 1,467,726.82
5. Step 5: Solve for x
   x = 1,467,726.82/1,367.31
6. Step 6: Final answer
   x = 1,073.44