Finding the Fourth Proportional to 1,019.43, 1,406.85 and 626.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.43 : 1,406.85 = 626.31 : x
2. Step 2: Convert to fraction form
   1,019.43/1,406.85 = 626.31/x
3. Step 3: Cross multiply
   1,019.43x = 1,406.85 × 626.31
4. Step 4: Simplify right side
   1,019.43x = 881,124.22
5. Step 5: Solve for x
   x = 881,124.22/1,019.43
6. Step 6: Final answer
   x = 864.33