Finding the Fourth Proportional to 1,145.59, 1,580.76 and 648.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.59 : 1,580.76 = 648.13 : x
2. Step 2: Convert to fraction form
   1,145.59/1,580.76 = 648.13/x
3. Step 3: Cross multiply
   1,145.59x = 1,580.76 × 648.13
4. Step 4: Simplify right side
   1,145.59x = 1,024,537.98
5. Step 5: Solve for x
   x = 1,024,537.98/1,145.59
6. Step 6: Final answer
   x = 894.33