Finding the Fourth Proportional to 2,108.90, 2,910.67 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.90 : 2,910.67 = 1,224.72 : x
2. Step 2: Convert to fraction form
   2,108.90/2,910.67 = 1,224.72/x
3. Step 3: Cross multiply
   2,108.90x = 2,910.67 × 1,224.72
4. Step 4: Simplify right side
   2,108.90x = 3,564,752.70
5. Step 5: Solve for x
   x = 3,564,752.70/2,108.90
6. Step 6: Final answer
   x = 1,690.34