Finding the Fourth Proportional to 1,407.48, 1,942.27 and 817.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.48 : 1,942.27 = 817.98 : x
2. Step 2: Convert to fraction form
   1,407.48/1,942.27 = 817.98/x
3. Step 3: Cross multiply
   1,407.48x = 1,942.27 × 817.98
4. Step 4: Simplify right side
   1,407.48x = 1,588,738.01
5. Step 5: Solve for x
   x = 1,588,738.01/1,407.48
6. Step 6: Final answer
   x = 1,128.78