Finding the Fourth Proportional to 1,407.70, 1,942.59 and 818.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.70 : 1,942.59 = 818.34 : x
2. Step 2: Convert to fraction form
   1,407.70/1,942.59 = 818.34/x
3. Step 3: Cross multiply
   1,407.70x = 1,942.59 × 818.34
4. Step 4: Simplify right side
   1,407.70x = 1,589,699.10
5. Step 5: Solve for x
   x = 1,589,699.10/1,407.70
6. Step 6: Final answer
   x = 1,129.29