Finding the Fourth Proportional to 2,113.57, 3,172.30 and 1,074.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.57 : 3,172.30 = 1,074.30 : x
2. Step 2: Convert to fraction form
   2,113.57/3,172.30 = 1,074.30/x
3. Step 3: Cross multiply
   2,113.57x = 3,172.30 × 1,074.30
4. Step 4: Simplify right side
   2,113.57x = 3,408,001.89
5. Step 5: Solve for x
   x = 3,408,001.89/2,113.57
6. Step 6: Final answer
   x = 1,612.44