Finding the Fourth Proportional to 1,227.15, 1,837.47 and 648.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.15 : 1,837.47 = 648.27 : x
2. Step 2: Convert to fraction form
   1,227.15/1,837.47 = 648.27/x
3. Step 3: Cross multiply
   1,227.15x = 1,837.47 × 648.27
4. Step 4: Simplify right side
   1,227.15x = 1,191,176.68
5. Step 5: Solve for x
   x = 1,191,176.68/1,227.15
6. Step 6: Final answer
   x = 970.69