Finding the Fourth Proportional to 2,109.24, 2,909.52 and 1,224.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.24 : 2,909.52 = 1,224.92 : x
2. Step 2: Convert to fraction form
   2,109.24/2,909.52 = 1,224.92/x
3. Step 3: Cross multiply
   2,109.24x = 2,909.52 × 1,224.92
4. Step 4: Simplify right side
   2,109.24x = 3,563,936.51
5. Step 5: Solve for x
   x = 3,563,936.51/2,109.24
6. Step 6: Final answer
   x = 1,689.68