Finding the Fourth Proportional to 1,321.72, 1,984.83 and 1,102.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.72 : 1,984.83 = 1,102.12 : x
2. Step 2: Convert to fraction form
   1,321.72/1,984.83 = 1,102.12/x
3. Step 3: Cross multiply
   1,321.72x = 1,984.83 × 1,102.12
4. Step 4: Simplify right side
   1,321.72x = 2,187,520.84
5. Step 5: Solve for x
   x = 2,187,520.84/1,321.72
6. Step 6: Final answer
   x = 1,655.06