Finding the Fourth Proportional to 1,047.75, 1,445.89 and 628.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.75 : 1,445.89 = 628.34 : x
2. Step 2: Convert to fraction form
   1,047.75/1,445.89 = 628.34/x
3. Step 3: Cross multiply
   1,047.75x = 1,445.89 × 628.34
4. Step 4: Simplify right side
   1,047.75x = 908,511.03
5. Step 5: Solve for x
   x = 908,511.03/1,047.75
6. Step 6: Final answer
   x = 867.11