Finding the Fourth Proportional to 1,407.39, 1,942.22 and 817.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.39 : 1,942.22 = 817.95 : x
2. Step 2: Convert to fraction form
   1,407.39/1,942.22 = 817.95/x
3. Step 3: Cross multiply
   1,407.39x = 1,942.22 × 817.95
4. Step 4: Simplify right side
   1,407.39x = 1,588,638.85
5. Step 5: Solve for x
   x = 1,588,638.85/1,407.39
6. Step 6: Final answer
   x = 1,128.78