Finding the Fourth Proportional to 2,072.16, 3,107.49 and 902.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.16 : 3,107.49 = 902.10 : x
2. Step 2: Convert to fraction form
   2,072.16/3,107.49 = 902.10/x
3. Step 3: Cross multiply
   2,072.16x = 3,107.49 × 902.10
4. Step 4: Simplify right side
   2,072.16x = 2,803,266.73
5. Step 5: Solve for x
   x = 2,803,266.73/2,072.16
6. Step 6: Final answer
   x = 1,352.82