Finding the Fourth Proportional to 1,447.39, 1,997.43 and 817.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.39 : 1,997.43 = 817.86 : x
2. Step 2: Convert to fraction form
   1,447.39/1,997.43 = 817.86/x
3. Step 3: Cross multiply
   1,447.39x = 1,997.43 × 817.86
4. Step 4: Simplify right side
   1,447.39x = 1,633,622.52
5. Step 5: Solve for x
   x = 1,633,622.52/1,447.39
6. Step 6: Final answer
   x = 1,128.67