Finding the Fourth Proportional to 2,108.50, 2,910.40 and 1,224.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.50 : 2,910.40 = 1,224.13 : x
2. Step 2: Convert to fraction form
   2,108.50/2,910.40 = 1,224.13/x
3. Step 3: Cross multiply
   2,108.50x = 2,910.40 × 1,224.13
4. Step 4: Simplify right side
   2,108.50x = 3,562,693.40
5. Step 5: Solve for x
   x = 3,562,693.40/2,108.50
6. Step 6: Final answer
   x = 1,689.69