Finding the Fourth Proportional to 1,173.82, 1,620.55 and 876.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.82 : 1,620.55 = 876.71 : x
2. Step 2: Convert to fraction form
   1,173.82/1,620.55 = 876.71/x
3. Step 3: Cross multiply
   1,173.82x = 1,620.55 × 876.71
4. Step 4: Simplify right side
   1,173.82x = 1,420,739.90
5. Step 5: Solve for x
   x = 1,420,739.90/1,173.82
6. Step 6: Final answer
   x = 1,210.36