Finding the Fourth Proportional to 1,019.44, 1,406.72 and 626.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.44 : 1,406.72 = 626.64 : x
2. Step 2: Convert to fraction form
   1,019.44/1,406.72 = 626.64/x
3. Step 3: Cross multiply
   1,019.44x = 1,406.72 × 626.64
4. Step 4: Simplify right side
   1,019.44x = 881,507.02
5. Step 5: Solve for x
   x = 881,507.02/1,019.44
6. Step 6: Final answer
   x = 864.70