Finding the Fourth Proportional to 1,645.71, 2,468.69 and 1,280.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.71 : 2,468.69 = 1,280.94 : x
2. Step 2: Convert to fraction form
   1,645.71/2,468.69 = 1,280.94/x
3. Step 3: Cross multiply
   1,645.71x = 2,468.69 × 1,280.94
4. Step 4: Simplify right side
   1,645.71x = 3,162,243.77
5. Step 5: Solve for x
   x = 3,162,243.77/1,645.71
6. Step 6: Final answer
   x = 1,921.51