Finding the Fourth Proportional to 2,640.63, 3,961.01 and 1,478.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.63 : 3,961.01 = 1,478.06 : x
2. Step 2: Convert to fraction form
   2,640.63/3,961.01 = 1,478.06/x
3. Step 3: Cross multiply
   2,640.63x = 3,961.01 × 1,478.06
4. Step 4: Simplify right side
   2,640.63x = 5,854,583.25
5. Step 5: Solve for x
   x = 5,854,583.25/2,640.63
6. Step 6: Final answer
   x = 2,217.12