Finding the Fourth Proportional to 1,019.59, 1,407.07 and 626.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.59 : 1,407.07 = 626.74 : x
2. Step 2: Convert to fraction form
   1,019.59/1,407.07 = 626.74/x
3. Step 3: Cross multiply
   1,019.59x = 1,407.07 × 626.74
4. Step 4: Simplify right side
   1,019.59x = 881,864.32
5. Step 5: Solve for x
   x = 881,864.32/1,019.59
6. Step 6: Final answer
   x = 864.92