Finding the Fourth Proportional to 1,145.63, 1,581.20 and 648.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.63 : 1,581.20 = 648.29 : x
2. Step 2: Convert to fraction form
   1,145.63/1,581.20 = 648.29/x
3. Step 3: Cross multiply
   1,145.63x = 1,581.20 × 648.29
4. Step 4: Simplify right side
   1,145.63x = 1,025,065.00
5. Step 5: Solve for x
   x = 1,025,065.00/1,145.63
6. Step 6: Final answer
   x = 894.76