Finding the Fourth Proportional to 1,407.71, 1,942.76 and 818.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.71 : 1,942.76 = 818.43 : x
2. Step 2: Convert to fraction form
   1,407.71/1,942.76 = 818.43/x
3. Step 3: Cross multiply
   1,407.71x = 1,942.76 × 818.43
4. Step 4: Simplify right side
   1,407.71x = 1,590,008.97
5. Step 5: Solve for x
   x = 1,590,008.97/1,407.71
6. Step 6: Final answer
   x = 1,129.50