Finding the Fourth Proportional to 2,621.13, 3,928.86 and 1,322.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.13 : 3,928.86 = 1,322.70 : x
2. Step 2: Convert to fraction form
   2,621.13/3,928.86 = 1,322.70/x
3. Step 3: Cross multiply
   2,621.13x = 3,928.86 × 1,322.70
4. Step 4: Simplify right side
   2,621.13x = 5,196,703.12
5. Step 5: Solve for x
   x = 5,196,703.12/2,621.13
6. Step 6: Final answer
   x = 1,982.62