Finding the Fourth Proportional to 1,103.50, 1,651.13 and 690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.50 : 1,651.13 = 690.72 : x
2. Step 2: Convert to fraction form
   1,103.50/1,651.13 = 690.72/x
3. Step 3: Cross multiply
   1,103.50x = 1,651.13 × 690.72
4. Step 4: Simplify right side
   1,103.50x = 1,140,468.51
5. Step 5: Solve for x
   x = 1,140,468.51/1,103.50
6. Step 6: Final answer
   x = 1,033.50