Finding the Fourth Proportional to 1,555.31, 2,146.79 and 926.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.31 : 2,146.79 = 926.28 : x
2. Step 2: Convert to fraction form
   1,555.31/2,146.79 = 926.28/x
3. Step 3: Cross multiply
   1,555.31x = 2,146.79 × 926.28
4. Step 4: Simplify right side
   1,555.31x = 1,988,530.96
5. Step 5: Solve for x
   x = 1,988,530.96/1,555.31
6. Step 6: Final answer
   x = 1,278.54