Finding the Fourth Proportional to 1,222.29, 1,833.38 and 878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.29 : 1,833.38 = 878.50 : x
2. Step 2: Convert to fraction form
   1,222.29/1,833.38 = 878.50/x
3. Step 3: Cross multiply
   1,222.29x = 1,833.38 × 878.50
4. Step 4: Simplify right side
   1,222.29x = 1,610,620.15
5. Step 5: Solve for x
   x = 1,610,620.15/1,222.29
6. Step 6: Final answer
   x = 1,317.71