Finding the Fourth Proportional to 2,170.28, 2,995.02 and 1,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,170.28 : 2,995.02 = 1,238.72 : x
2. Step 2: Convert to fraction form
   2,170.28/2,995.02 = 1,238.72/x
3. Step 3: Cross multiply
   2,170.28x = 2,995.02 × 1,238.72
4. Step 4: Simplify right side
   2,170.28x = 3,709,991.17
5. Step 5: Solve for x
   x = 3,709,991.17/2,170.28
6. Step 6: Final answer
   x = 1,709.45