Finding the Fourth Proportional to 2,390.72, 3,300.72 and 1,729.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.72 : 3,300.72 = 1,729.76 : x
2. Step 2: Convert to fraction form
   2,390.72/3,300.72 = 1,729.76/x
3. Step 3: Cross multiply
   2,390.72x = 3,300.72 × 1,729.76
4. Step 4: Simplify right side
   2,390.72x = 5,709,453.43
5. Step 5: Solve for x
   x = 5,709,453.43/2,390.72
6. Step 6: Final answer
   x = 2,388.17