Finding the Fourth Proportional to 1,639.68, 2,456.25 and 1,061.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,639.68 : 2,456.25 = 1,061.34 : x
2. Step 2: Convert to fraction form
   1,639.68/2,456.25 = 1,061.34/x
3. Step 3: Cross multiply
   1,639.68x = 2,456.25 × 1,061.34
4. Step 4: Simplify right side
   1,639.68x = 2,606,916.38
5. Step 5: Solve for x
   x = 2,606,916.38/1,639.68
6. Step 6: Final answer
   x = 1,589.89