Finding the Fourth Proportional to 2,109.29, 2,909.31 and 1,611.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.29 : 2,909.31 = 1,611.07 : x
2. Step 2: Convert to fraction form
   2,109.29/2,909.31 = 1,611.07/x
3. Step 3: Cross multiply
   2,109.29x = 2,909.31 × 1,611.07
4. Step 4: Simplify right side
   2,109.29x = 4,687,088.75
5. Step 5: Solve for x
   x = 4,687,088.75/2,109.29
6. Step 6: Final answer
   x = 2,222.12