Finding the Fourth Proportional to 1,447.86, 1,997.39 and 858.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,447.86 : 1,997.39 = 858.06 : x
2. Step 2: Convert to fraction form
   1,447.86/1,997.39 = 858.06/x
3. Step 3: Cross multiply
   1,447.86x = 1,997.39 × 858.06
4. Step 4: Simplify right side
   1,447.86x = 1,713,876.17
5. Step 5: Solve for x
   x = 1,713,876.17/1,447.86
6. Step 6: Final answer
   x = 1,183.73