Finding the Fourth Proportional to 1,343.10, 1,854.21 and 812.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.10 : 1,854.21 = 812.07 : x
2. Step 2: Convert to fraction form
   1,343.10/1,854.21 = 812.07/x
3. Step 3: Cross multiply
   1,343.10x = 1,854.21 × 812.07
4. Step 4: Simplify right side
   1,343.10x = 1,505,748.31
5. Step 5: Solve for x
   x = 1,505,748.31/1,343.10
6. Step 6: Final answer
   x = 1,121.10