Finding the Fourth Proportional to 2,113.56, 3,170.52 and 816.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.56 : 3,170.52 = 816.12 : x
2. Step 2: Convert to fraction form
   2,113.56/3,170.52 = 816.12/x
3. Step 3: Cross multiply
   2,113.56x = 3,170.52 × 816.12
4. Step 4: Simplify right side
   2,113.56x = 2,587,524.78
5. Step 5: Solve for x
   x = 2,587,524.78/2,113.56
6. Step 6: Final answer
   x = 1,224.25