Finding the Fourth Proportional to 1,081.72, 1,618.93 and 646.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.72 : 1,618.93 = 646.75 : x
2. Step 2: Convert to fraction form
   1,081.72/1,618.93 = 646.75/x
3. Step 3: Cross multiply
   1,081.72x = 1,618.93 × 646.75
4. Step 4: Simplify right side
   1,081.72x = 1,047,042.98
5. Step 5: Solve for x
   x = 1,047,042.98/1,081.72
6. Step 6: Final answer
   x = 967.94