Finding the Fourth Proportional to 2,261.50, 3,120.72 and 1,253.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.50 : 3,120.72 = 1,253.20 : x
2. Step 2: Convert to fraction form
   2,261.50/3,120.72 = 1,253.20/x
3. Step 3: Cross multiply
   2,261.50x = 3,120.72 × 1,253.20
4. Step 4: Simplify right side
   2,261.50x = 3,910,886.30
5. Step 5: Solve for x
   x = 3,910,886.30/2,261.50
6. Step 6: Final answer
   x = 1,729.33