Finding the Fourth Proportional to 2,128.35, 3,191.00 and 812.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.35 : 3,191.00 = 812.01 : x
2. Step 2: Convert to fraction form
   2,128.35/3,191.00 = 812.01/x
3. Step 3: Cross multiply
   2,128.35x = 3,191.00 × 812.01
4. Step 4: Simplify right side
   2,128.35x = 2,591,119.85
5. Step 5: Solve for x
   x = 2,591,119.85/2,128.35
6. Step 6: Final answer
   x = 1,217.43