Finding the Fourth Proportional to 1,761.12, 2,642.54 and 721.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,761.12 : 2,642.54 = 721.89 : x
2. Step 2: Convert to fraction form
   1,761.12/2,642.54 = 721.89/x
3. Step 3: Cross multiply
   1,761.12x = 2,642.54 × 721.89
4. Step 4: Simplify right side
   1,761.12x = 1,907,619.59
5. Step 5: Solve for x
   x = 1,907,619.59/1,761.12
6. Step 6: Final answer
   x = 1,083.19