Finding the Fourth Proportional to 1,761.78, 2,641.86 and 722.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,761.78 : 2,641.86 = 722.28 : x
2. Step 2: Convert to fraction form
   1,761.78/2,641.86 = 722.28/x
3. Step 3: Cross multiply
   1,761.78x = 2,641.86 × 722.28
4. Step 4: Simplify right side
   1,761.78x = 1,908,162.64
5. Step 5: Solve for x
   x = 1,908,162.64/1,761.78
6. Step 6: Final answer
   x = 1,083.09