Finding the Fourth Proportional to 1,145.71, 1,580.63 and 648.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.71 : 1,580.63 = 648.23 : x
2. Step 2: Convert to fraction form
   1,145.71/1,580.63 = 648.23/x
3. Step 3: Cross multiply
   1,145.71x = 1,580.63 × 648.23
4. Step 4: Simplify right side
   1,145.71x = 1,024,611.78
5. Step 5: Solve for x
   x = 1,024,611.78/1,145.71
6. Step 6: Final answer
   x = 894.31