Finding the Fourth Proportional to 1,105.30, 1,671.06 and 1,105.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.30 : 1,671.06 = 1,105.30 : x
2. Step 2: Convert to fraction form
   1,105.30/1,671.06 = 1,105.30/x
3. Step 3: Cross multiply
   1,105.30x = 1,671.06 × 1,105.30
4. Step 4: Simplify right side
   1,105.30x = 1,847,022.62
5. Step 5: Solve for x
   x = 1,847,022.62/1,105.30
6. Step 6: Final answer
   x = 1,671.06