Finding the Fourth Proportional to 1,621.57, 2,429.92 and 971.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.57 : 2,429.92 = 971.55 : x
2. Step 2: Convert to fraction form
   1,621.57/2,429.92 = 971.55/x
3. Step 3: Cross multiply
   1,621.57x = 2,429.92 × 971.55
4. Step 4: Simplify right side
   1,621.57x = 2,360,788.78
5. Step 5: Solve for x
   x = 2,360,788.78/1,621.57
6. Step 6: Final answer
   x = 1,455.87