Finding the Fourth Proportional to 3,471.42, 5,206.71 and 1,280.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,471.42 : 5,206.71 = 1,280.10 : x
2. Step 2: Convert to fraction form
   3,471.42/5,206.71 = 1,280.10/x
3. Step 3: Cross multiply
   3,471.42x = 5,206.71 × 1,280.10
4. Step 4: Simplify right side
   3,471.42x = 6,665,109.47
5. Step 5: Solve for x
   x = 6,665,109.47/3,471.42
6. Step 6: Final answer
   x = 1,920.00