Finding the Fourth Proportional to 1,145.48, 1,580.83 and 648.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.48 : 1,580.83 = 648.14 : x
2. Step 2: Convert to fraction form
   1,145.48/1,580.83 = 648.14/x
3. Step 3: Cross multiply
   1,145.48x = 1,580.83 × 648.14
4. Step 4: Simplify right side
   1,145.48x = 1,024,589.63
5. Step 5: Solve for x
   x = 1,024,589.63/1,145.48
6. Step 6: Final answer
   x = 894.47