Finding the Fourth Proportional to 2,111.55, 3,166.36 and 878.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.55 : 3,166.36 = 878.22 : x
2. Step 2: Convert to fraction form
   2,111.55/3,166.36 = 878.22/x
3. Step 3: Cross multiply
   2,111.55x = 3,166.36 × 878.22
4. Step 4: Simplify right side
   2,111.55x = 2,780,756.29
5. Step 5: Solve for x
   x = 2,780,756.29/2,111.55
6. Step 6: Final answer
   x = 1,316.93