Finding the Fourth Proportional to 2,021.30, 2,725.88 and 2,021.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.30 : 2,725.88 = 2,021.30 : x
2. Step 2: Convert to fraction form
   2,021.30/2,725.88 = 2,021.30/x
3. Step 3: Cross multiply
   2,021.30x = 2,725.88 × 2,021.30
4. Step 4: Simplify right side
   2,021.30x = 5,509,811.14
5. Step 5: Solve for x
   x = 5,509,811.14/2,021.30
6. Step 6: Final answer
   x = 2,725.88