Finding the Fourth Proportional to 1,983.13, 2,972.37 and 1,105.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.13 : 2,972.37 = 1,105.21 : x
2. Step 2: Convert to fraction form
   1,983.13/2,972.37 = 1,105.21/x
3. Step 3: Cross multiply
   1,983.13x = 2,972.37 × 1,105.21
4. Step 4: Simplify right side
   1,983.13x = 3,285,093.05
5. Step 5: Solve for x
   x = 3,285,093.05/1,983.13
6. Step 6: Final answer
   x = 1,656.52