Finding the Fourth Proportional to 1,019.28, 1,406.60 and 626.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.28 : 1,406.60 = 626.32 : x
2. Step 2: Convert to fraction form
   1,019.28/1,406.60 = 626.32/x
3. Step 3: Cross multiply
   1,019.28x = 1,406.60 × 626.32
4. Step 4: Simplify right side
   1,019.28x = 880,981.71
5. Step 5: Solve for x
   x = 880,981.71/1,019.28
6. Step 6: Final answer
   x = 864.32