Finding the Fourth Proportional to 2,105.28, 2,905.47 and 1,266.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.28 : 2,905.47 = 1,266.30 : x
2. Step 2: Convert to fraction form
   2,105.28/2,905.47 = 1,266.30/x
3. Step 3: Cross multiply
   2,105.28x = 2,905.47 × 1,266.30
4. Step 4: Simplify right side
   2,105.28x = 3,679,196.66
5. Step 5: Solve for x
   x = 3,679,196.66/2,105.28
6. Step 6: Final answer
   x = 1,747.60