Finding the Fourth Proportional to 1,145.55, 1,580.78 and 648.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.55 : 1,580.78 = 648.24 : x
2. Step 2: Convert to fraction form
   1,145.55/1,580.78 = 648.24/x
3. Step 3: Cross multiply
   1,145.55x = 1,580.78 × 648.24
4. Step 4: Simplify right side
   1,145.55x = 1,024,721.59
5. Step 5: Solve for x
   x = 1,024,721.59/1,145.55
6. Step 6: Final answer
   x = 894.52