Finding the Fourth Proportional to 1,407.92, 1,942.56 and 818.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.92 : 1,942.56 = 818.48 : x
2. Step 2: Convert to fraction form
   1,407.92/1,942.56 = 818.48/x
3. Step 3: Cross multiply
   1,407.92x = 1,942.56 × 818.48
4. Step 4: Simplify right side
   1,407.92x = 1,589,946.51
5. Step 5: Solve for x
   x = 1,589,946.51/1,407.92
6. Step 6: Final answer
   x = 1,129.29