Finding the Fourth Proportional to 1,967.27, 2,715.37 and 1,220.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,967.27 : 2,715.37 = 1,220.79 : x
2. Step 2: Convert to fraction form
   1,967.27/2,715.37 = 1,220.79/x
3. Step 3: Cross multiply
   1,967.27x = 2,715.37 × 1,220.79
4. Step 4: Simplify right side
   1,967.27x = 3,314,903.67
5. Step 5: Solve for x
   x = 3,314,903.67/1,967.27
6. Step 6: Final answer
   x = 1,685.03