Finding the Fourth Proportional to 1,081.07, 1,490.69 and 731.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.07 : 1,490.69 = 731.15 : x
2. Step 2: Convert to fraction form
   1,081.07/1,490.69 = 731.15/x
3. Step 3: Cross multiply
   1,081.07x = 1,490.69 × 731.15
4. Step 4: Simplify right side
   1,081.07x = 1,089,910.54
5. Step 5: Solve for x
   x = 1,089,910.54/1,081.07
6. Step 6: Final answer
   x = 1,008.18