Finding the Fourth Proportional to 2,113.90, 3,171.30 and 1,074.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.90 : 3,171.30 = 1,074.04 : x
2. Step 2: Convert to fraction form
   2,113.90/3,171.30 = 1,074.04/x
3. Step 3: Cross multiply
   2,113.90x = 3,171.30 × 1,074.04
4. Step 4: Simplify right side
   2,113.90x = 3,406,103.05
5. Step 5: Solve for x
   x = 3,406,103.05/2,113.90
6. Step 6: Final answer
   x = 1,611.29