Finding the Fourth Proportional to 2,111.10, 3,164.85 and 812.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.10 : 3,164.85 = 812.22 : x
2. Step 2: Convert to fraction form
   2,111.10/3,164.85 = 812.22/x
3. Step 3: Cross multiply
   2,111.10x = 3,164.85 × 812.22
4. Step 4: Simplify right side
   2,111.10x = 2,570,554.47
5. Step 5: Solve for x
   x = 2,570,554.47/2,111.10
6. Step 6: Final answer
   x = 1,217.64