Finding the Fourth Proportional to 1,341.64, 1,851.56 and 817.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,341.64 : 1,851.56 = 817.72 : x
2. Step 2: Convert to fraction form
   1,341.64/1,851.56 = 817.72/x
3. Step 3: Cross multiply
   1,341.64x = 1,851.56 × 817.72
4. Step 4: Simplify right side
   1,341.64x = 1,514,057.64
5. Step 5: Solve for x
   x = 1,514,057.64/1,341.64
6. Step 6: Final answer
   x = 1,128.51