Finding the Fourth Proportional to 1,409.79, 1,945.61 and 812.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.79 : 1,945.61 = 812.49 : x
2. Step 2: Convert to fraction form
   1,409.79/1,945.61 = 812.49/x
3. Step 3: Cross multiply
   1,409.79x = 1,945.61 × 812.49
4. Step 4: Simplify right side
   1,409.79x = 1,580,788.67
5. Step 5: Solve for x
   x = 1,580,788.67/1,409.79
6. Step 6: Final answer
   x = 1,121.29