Finding the Fourth Proportional to 1,145.59, 1,580.82 and 648.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.59 : 1,580.82 = 648.32 : x
2. Step 2: Convert to fraction form
   1,145.59/1,580.82 = 648.32/x
3. Step 3: Cross multiply
   1,145.59x = 1,580.82 × 648.32
4. Step 4: Simplify right side
   1,145.59x = 1,024,866.89
5. Step 5: Solve for x
   x = 1,024,866.89/1,145.59
6. Step 6: Final answer
   x = 894.62