Finding the Fourth Proportional to 1,019.72, 1,407.08 and 626.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.72 : 1,407.08 = 626.64 : x
2. Step 2: Convert to fraction form
   1,019.72/1,407.08 = 626.64/x
3. Step 3: Cross multiply
   1,019.72x = 1,407.08 × 626.64
4. Step 4: Simplify right side
   1,019.72x = 881,732.61
5. Step 5: Solve for x
   x = 881,732.61/1,019.72
6. Step 6: Final answer
   x = 864.68