Finding the Fourth Proportional to 1,761.29, 2,431.20 and 1,089.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,761.29 : 2,431.20 = 1,089.61 : x
2. Step 2: Convert to fraction form
   1,761.29/2,431.20 = 1,089.61/x
3. Step 3: Cross multiply
   1,761.29x = 2,431.20 × 1,089.61
4. Step 4: Simplify right side
   1,761.29x = 2,649,071.52
5. Step 5: Solve for x
   x = 2,649,071.52/1,761.29
6. Step 6: Final answer
   x = 1,504.05