Finding the Fourth Proportional to 1,456.27, 2,009.32 and 1,221.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.27 : 2,009.32 = 1,221.17 : x
2. Step 2: Convert to fraction form
   1,456.27/2,009.32 = 1,221.17/x
3. Step 3: Cross multiply
   1,456.27x = 2,009.32 × 1,221.17
4. Step 4: Simplify right side
   1,456.27x = 2,453,711.26
5. Step 5: Solve for x
   x = 2,453,711.26/1,456.27
6. Step 6: Final answer
   x = 1,684.93