Finding the Fourth Proportional to 1,048.59, 1,446.89 and 628.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.59 : 1,446.89 = 628.88 : x
2. Step 2: Convert to fraction form
   1,048.59/1,446.89 = 628.88/x
3. Step 3: Cross multiply
   1,048.59x = 1,446.89 × 628.88
4. Step 4: Simplify right side
   1,048.59x = 909,909.80
5. Step 5: Solve for x
   x = 909,909.80/1,048.59
6. Step 6: Final answer
   x = 867.75