Finding the Fourth Proportional to 1,103.12, 1,648.20 and 1,064.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.12 : 1,648.20 = 1,064.85 : x
2. Step 2: Convert to fraction form
   1,103.12/1,648.20 = 1,064.85/x
3. Step 3: Cross multiply
   1,103.12x = 1,648.20 × 1,064.85
4. Step 4: Simplify right side
   1,103.12x = 1,755,085.77
5. Step 5: Solve for x
   x = 1,755,085.77/1,103.12
6. Step 6: Final answer
   x = 1,591.03