Finding the Fourth Proportional to 2,111.04, 3,165.95 and 812.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.04 : 3,165.95 = 812.20 : x
2. Step 2: Convert to fraction form
   2,111.04/3,165.95 = 812.20/x
3. Step 3: Cross multiply
   2,111.04x = 3,165.95 × 812.20
4. Step 4: Simplify right side
   2,111.04x = 2,571,384.59
5. Step 5: Solve for x
   x = 2,571,384.59/2,111.04
6. Step 6: Final answer
   x = 1,218.07