Finding the Fourth Proportional to 1,991.40, 2,747.73 and 1,292.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.40 : 2,747.73 = 1,292.37 : x
2. Step 2: Convert to fraction form
   1,991.40/2,747.73 = 1,292.37/x
3. Step 3: Cross multiply
   1,991.40x = 2,747.73 × 1,292.37
4. Step 4: Simplify right side
   1,991.40x = 3,551,083.82
5. Step 5: Solve for x
   x = 3,551,083.82/1,991.40
6. Step 6: Final answer
   x = 1,783.21