Finding the Fourth Proportional to 1,081.82, 1,624.80 and 671.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.82 : 1,624.80 = 671.72 : x
2. Step 2: Convert to fraction form
   1,081.82/1,624.80 = 671.72/x
3. Step 3: Cross multiply
   1,081.82x = 1,624.80 × 671.72
4. Step 4: Simplify right side
   1,081.82x = 1,091,410.66
5. Step 5: Solve for x
   x = 1,091,410.66/1,081.82
6. Step 6: Final answer
   x = 1,008.87