Finding the Fourth Proportional to 871.83, 1,201.83 and 684.72

Step by Step Solution

1. Step 1: Write the proportion equation
   871.83 : 1,201.83 = 684.72 : x
2. Step 2: Convert to fraction form
   871.83/1,201.83 = 684.72/x
3. Step 3: Cross multiply
   871.83x = 1,201.83 × 684.72
4. Step 4: Simplify right side
   871.83x = 822,917.04
5. Step 5: Solve for x
   x = 822,917.04/871.83
6. Step 6: Final answer
   x = 943.90