Finding the Fourth Proportional to 2,013.30, 2,821.50 and 2,013.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.30 : 2,821.50 = 2,013.30 : x
2. Step 2: Convert to fraction form
   2,013.30/2,821.50 = 2,013.30/x
3. Step 3: Cross multiply
   2,013.30x = 2,821.50 × 2,013.30
4. Step 4: Simplify right side
   2,013.30x = 5,680,525.95
5. Step 5: Solve for x
   x = 5,680,525.95/2,013.30
6. Step 6: Final answer
   x = 2,821.50