Finding the Fourth Proportional to 1,047.83, 1,445.78 and 628.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.83 : 1,445.78 = 628.07 : x
2. Step 2: Convert to fraction form
   1,047.83/1,445.78 = 628.07/x
3. Step 3: Cross multiply
   1,047.83x = 1,445.78 × 628.07
4. Step 4: Simplify right side
   1,047.83x = 908,045.39
5. Step 5: Solve for x
   x = 908,045.39/1,047.83
6. Step 6: Final answer
   x = 866.60