Finding the Fourth Proportional to 1,640.82, 2,460.42 and 1,485.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.82 : 2,460.42 = 1,485.30 : x
2. Step 2: Convert to fraction form
   1,640.82/2,460.42 = 1,485.30/x
3. Step 3: Cross multiply
   1,640.82x = 2,460.42 × 1,485.30
4. Step 4: Simplify right side
   1,640.82x = 3,654,461.83
5. Step 5: Solve for x
   x = 3,654,461.83/1,640.82
6. Step 6: Final answer
   x = 2,227.22