Finding the Fourth Proportional to 1,356.75, 1,869.75 and 1,222.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.75 : 1,869.75 = 1,222.56 : x
2. Step 2: Convert to fraction form
   1,356.75/1,869.75 = 1,222.56/x
3. Step 3: Cross multiply
   1,356.75x = 1,869.75 × 1,222.56
4. Step 4: Simplify right side
   1,356.75x = 2,285,881.56
5. Step 5: Solve for x
   x = 2,285,881.56/1,356.75
6. Step 6: Final answer
   x = 1,684.82