Finding the Fourth Proportional to 1,648.10, 2,469.90 and 1,061.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.10 : 2,469.90 = 1,061.30 : x
2. Step 2: Convert to fraction form
   1,648.10/2,469.90 = 1,061.30/x
3. Step 3: Cross multiply
   1,648.10x = 2,469.90 × 1,061.30
4. Step 4: Simplify right side
   1,648.10x = 2,621,304.87
5. Step 5: Solve for x
   x = 2,621,304.87/1,648.10
6. Step 6: Final answer
   x = 1,590.50