Finding the Fourth Proportional to 1,040.80, 1,435.68 and 626.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.80 : 1,435.68 = 626.72 : x
2. Step 2: Convert to fraction form
   1,040.80/1,435.68 = 626.72/x
3. Step 3: Cross multiply
   1,040.80x = 1,435.68 × 626.72
4. Step 4: Simplify right side
   1,040.80x = 899,769.37
5. Step 5: Solve for x
   x = 899,769.37/1,040.80
6. Step 6: Final answer
   x = 864.50