Finding the Fourth Proportional to 1,409.68, 1,945.52 and 812.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.68 : 1,945.52 = 812.31 : x
2. Step 2: Convert to fraction form
   1,409.68/1,945.52 = 812.31/x
3. Step 3: Cross multiply
   1,409.68x = 1,945.52 × 812.31
4. Step 4: Simplify right side
   1,409.68x = 1,580,365.35
5. Step 5: Solve for x
   x = 1,580,365.35/1,409.68
6. Step 6: Final answer
   x = 1,121.08