Finding the Fourth Proportional to 1,103.40, 1,647.33 and 1,012.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.40 : 1,647.33 = 1,012.20 : x
2. Step 2: Convert to fraction form
   1,103.40/1,647.33 = 1,012.20/x
3. Step 3: Cross multiply
   1,103.40x = 1,647.33 × 1,012.20
4. Step 4: Simplify right side
   1,103.40x = 1,667,427.43
5. Step 5: Solve for x
   x = 1,667,427.43/1,103.40
6. Step 6: Final answer
   x = 1,511.17