Finding the Fourth Proportional to 1,021.05, 1,409.25 and 648.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,021.05 : 1,409.25 = 648.47 : x
2. Step 2: Convert to fraction form
   1,021.05/1,409.25 = 648.47/x
3. Step 3: Cross multiply
   1,021.05x = 1,409.25 × 648.47
4. Step 4: Simplify right side
   1,021.05x = 913,849.30
5. Step 5: Solve for x
   x = 913,849.30/1,021.05
6. Step 6: Final answer
   x = 895.01