Finding the Fourth Proportional to 2,013.57, 3,020.40 and 715.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.57 : 3,020.40 = 715.05 : x
2. Step 2: Convert to fraction form
   2,013.57/3,020.40 = 715.05/x
3. Step 3: Cross multiply
   2,013.57x = 3,020.40 × 715.05
4. Step 4: Simplify right side
   2,013.57x = 2,159,737.02
5. Step 5: Solve for x
   x = 2,159,737.02/2,013.57
6. Step 6: Final answer
   x = 1,072.59