Finding the Fourth Proportional to 1,407.26, 1,942.29 and 817.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.26 : 1,942.29 = 817.89 : x
2. Step 2: Convert to fraction form
   1,407.26/1,942.29 = 817.89/x
3. Step 3: Cross multiply
   1,407.26x = 1,942.29 × 817.89
4. Step 4: Simplify right side
   1,407.26x = 1,588,579.57
5. Step 5: Solve for x
   x = 1,588,579.57/1,407.26
6. Step 6: Final answer
   x = 1,128.85