Finding the Fourth Proportional to 1,407.56, 1,942.32 and 818.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.56 : 1,942.32 = 818.13 : x
2. Step 2: Convert to fraction form
   1,407.56/1,942.32 = 818.13/x
3. Step 3: Cross multiply
   1,407.56x = 1,942.32 × 818.13
4. Step 4: Simplify right side
   1,407.56x = 1,589,060.55
5. Step 5: Solve for x
   x = 1,589,060.55/1,407.56
6. Step 6: Final answer
   x = 1,128.95