Finding the Fourth Proportional to 1,639.05, 2,261.98 and 1,580.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.05 : 2,261.98 = 1,580.25 : x
2. Step 2: Convert to fraction form
   1,639.05/2,261.98 = 1,580.25/x
3. Step 3: Cross multiply
   1,639.05x = 2,261.98 × 1,580.25
4. Step 4: Simplify right side
   1,639.05x = 3,574,493.90
5. Step 5: Solve for x
   x = 3,574,493.90/1,639.05
6. Step 6: Final answer
   x = 2,180.83