Finding the Fourth Proportional to 2,616.22, 3,923.32 and 972.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.22 : 3,923.32 = 972.40 : x
2. Step 2: Convert to fraction form
   2,616.22/3,923.32 = 972.40/x
3. Step 3: Cross multiply
   2,616.22x = 3,923.32 × 972.40
4. Step 4: Simplify right side
   2,616.22x = 3,815,011.89
5. Step 5: Solve for x
   x = 3,815,011.89/2,616.22
6. Step 6: Final answer
   x = 1,458.22