Finding the Fourth Proportional to 1,645.94, 2,271.52 and 982.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.94 : 2,271.52 = 982.78 : x
2. Step 2: Convert to fraction form
   1,645.94/2,271.52 = 982.78/x
3. Step 3: Cross multiply
   1,645.94x = 2,271.52 × 982.78
4. Step 4: Simplify right side
   1,645.94x = 2,232,404.43
5. Step 5: Solve for x
   x = 2,232,404.43/1,645.94
6. Step 6: Final answer
   x = 1,356.31