Finding the Fourth Proportional to 2,172.40, 3,258.63 and 1,561.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.40 : 3,258.63 = 1,561.30 : x
2. Step 2: Convert to fraction form
   2,172.40/3,258.63 = 1,561.30/x
3. Step 3: Cross multiply
   2,172.40x = 3,258.63 × 1,561.30
4. Step 4: Simplify right side
   2,172.40x = 5,087,699.02
5. Step 5: Solve for x
   x = 5,087,699.02/2,172.40
6. Step 6: Final answer
   x = 2,341.97