Finding the Fourth Proportional to 1,086.87, 1,626.22 and 646.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.87 : 1,626.22 = 646.50 : x
2. Step 2: Convert to fraction form
   1,086.87/1,626.22 = 646.50/x
3. Step 3: Cross multiply
   1,086.87x = 1,626.22 × 646.50
4. Step 4: Simplify right side
   1,086.87x = 1,051,351.23
5. Step 5: Solve for x
   x = 1,051,351.23/1,086.87
6. Step 6: Final answer
   x = 967.32