Finding the Fourth Proportional to 1,171.83, 1,617.05 and 647.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.83 : 1,617.05 = 647.87 : x
2. Step 2: Convert to fraction form
   1,171.83/1,617.05 = 647.87/x
3. Step 3: Cross multiply
   1,171.83x = 1,617.05 × 647.87
4. Step 4: Simplify right side
   1,171.83x = 1,047,626.86
5. Step 5: Solve for x
   x = 1,047,626.86/1,171.83
6. Step 6: Final answer
   x = 894.01