Finding the Fourth Proportional to 2,621.57, 3,928.91 and 1,157.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.57 : 3,928.91 = 1,157.49 : x
2. Step 2: Convert to fraction form
   2,621.57/3,928.91 = 1,157.49/x
3. Step 3: Cross multiply
   2,621.57x = 3,928.91 × 1,157.49
4. Step 4: Simplify right side
   2,621.57x = 4,547,668.25
5. Step 5: Solve for x
   x = 4,547,668.25/2,621.57
6. Step 6: Final answer
   x = 1,734.72