Finding the Fourth Proportional to 1,920.06, 2,648.52 and 1,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.06 : 2,648.52 = 1,221.42 : x
2. Step 2: Convert to fraction form
   1,920.06/2,648.52 = 1,221.42/x
3. Step 3: Cross multiply
   1,920.06x = 2,648.52 × 1,221.42
4. Step 4: Simplify right side
   1,920.06x = 3,234,955.30
5. Step 5: Solve for x
   x = 3,234,955.30/1,920.06
6. Step 6: Final answer
   x = 1,684.82