Finding the Fourth Proportional to 2,108.42, 2,909.90 and 1,224.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.42 : 2,909.90 = 1,224.50 : x
2. Step 2: Convert to fraction form
   2,108.42/2,909.90 = 1,224.50/x
3. Step 3: Cross multiply
   2,108.42x = 2,909.90 × 1,224.50
4. Step 4: Simplify right side
   2,108.42x = 3,563,151.88
5. Step 5: Solve for x
   x = 3,563,151.88/2,108.42
6. Step 6: Final answer
   x = 1,689.97