Finding the Fourth Proportional to 3,561.55, 4,916.25 and 2,145.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,561.55 : 4,916.25 = 2,145.30 : x
2. Step 2: Convert to fraction form
   3,561.55/4,916.25 = 2,145.30/x
3. Step 3: Cross multiply
   3,561.55x = 4,916.25 × 2,145.30
4. Step 4: Simplify right side
   3,561.55x = 10,546,831.13
5. Step 5: Solve for x
   x = 10,546,831.13/3,561.55
6. Step 6: Final answer
   x = 2,961.30