Finding the Fourth Proportional to 1,036.94, 1,429.99 and 644.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.94 : 1,429.99 = 644.09 : x
2. Step 2: Convert to fraction form
   1,036.94/1,429.99 = 644.09/x
3. Step 3: Cross multiply
   1,036.94x = 1,429.99 × 644.09
4. Step 4: Simplify right side
   1,036.94x = 921,033.50
5. Step 5: Solve for x
   x = 921,033.50/1,036.94
6. Step 6: Final answer
   x = 888.23