Finding the Fourth Proportional to 2,109.16, 2,910.82 and 1,224.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.16 : 2,910.82 = 1,224.91 : x
2. Step 2: Convert to fraction form
   2,109.16/2,910.82 = 1,224.91/x
3. Step 3: Cross multiply
   2,109.16x = 2,910.82 × 1,224.91
4. Step 4: Simplify right side
   2,109.16x = 3,565,492.53
5. Step 5: Solve for x
   x = 3,565,492.53/2,109.16
6. Step 6: Final answer
   x = 1,690.48