Finding the Fourth Proportional to 1,407.18, 1,942.02 and 817.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.18 : 1,942.02 = 817.50 : x
2. Step 2: Convert to fraction form
   1,407.18/1,942.02 = 817.50/x
3. Step 3: Cross multiply
   1,407.18x = 1,942.02 × 817.50
4. Step 4: Simplify right side
   1,407.18x = 1,587,601.35
5. Step 5: Solve for x
   x = 1,587,601.35/1,407.18
6. Step 6: Final answer
   x = 1,128.21