Finding the Fourth Proportional to 1,145.27, 1,580.36 and 647.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.27 : 1,580.36 = 647.89 : x
2. Step 2: Convert to fraction form
   1,145.27/1,580.36 = 647.89/x
3. Step 3: Cross multiply
   1,145.27x = 1,580.36 × 647.89
4. Step 4: Simplify right side
   1,145.27x = 1,023,892.25
5. Step 5: Solve for x
   x = 1,023,892.25/1,145.27
6. Step 6: Final answer
   x = 894.02