Finding the Fourth Proportional to 1,047.71, 1,445.73 and 628.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.71 : 1,445.73 = 628.05 : x
2. Step 2: Convert to fraction form
   1,047.71/1,445.73 = 628.05/x
3. Step 3: Cross multiply
   1,047.71x = 1,445.73 × 628.05
4. Step 4: Simplify right side
   1,047.71x = 907,990.73
5. Step 5: Solve for x
   x = 907,990.73/1,047.71
6. Step 6: Final answer
   x = 866.64