Finding the Fourth Proportional to 1,272.31, 1,906.89 and 722.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.31 : 1,906.89 = 722.82 : x
2. Step 2: Convert to fraction form
   1,272.31/1,906.89 = 722.82/x
3. Step 3: Cross multiply
   1,272.31x = 1,906.89 × 722.82
4. Step 4: Simplify right side
   1,272.31x = 1,378,346.74
5. Step 5: Solve for x
   x = 1,378,346.74/1,272.31
6. Step 6: Final answer
   x = 1,083.34