Finding the Fourth Proportional to 1,639.57, 2,459.33 and 981.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.57 : 2,459.33 = 981.63 : x
2. Step 2: Convert to fraction form
   1,639.57/2,459.33 = 981.63/x
3. Step 3: Cross multiply
   1,639.57x = 2,459.33 × 981.63
4. Step 4: Simplify right side
   1,639.57x = 2,414,142.89
5. Step 5: Solve for x
   x = 2,414,142.89/1,639.57
6. Step 6: Final answer
   x = 1,472.43