Finding the Fourth Proportional to 2,648.56, 3,972.72 and 917.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.56 : 3,972.72 = 917.32 : x
2. Step 2: Convert to fraction form
   2,648.56/3,972.72 = 917.32/x
3. Step 3: Cross multiply
   2,648.56x = 3,972.72 × 917.32
4. Step 4: Simplify right side
   2,648.56x = 3,644,255.51
5. Step 5: Solve for x
   x = 3,644,255.51/2,648.56
6. Step 6: Final answer
   x = 1,375.94