Finding the Fourth Proportional to 2,108.52, 2,909.82 and 1,224.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.52 : 2,909.82 = 1,224.30 : x
2. Step 2: Convert to fraction form
   2,108.52/2,909.82 = 1,224.30/x
3. Step 3: Cross multiply
   2,108.52x = 2,909.82 × 1,224.30
4. Step 4: Simplify right side
   2,108.52x = 3,562,492.63
5. Step 5: Solve for x
   x = 3,562,492.63/2,108.52
6. Step 6: Final answer
   x = 1,689.57