Finding the Fourth Proportional to 1,445.84, 1,993.50 and 1,221.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.84 : 1,993.50 = 1,221.38 : x
2. Step 2: Convert to fraction form
   1,445.84/1,993.50 = 1,221.38/x
3. Step 3: Cross multiply
   1,445.84x = 1,993.50 × 1,221.38
4. Step 4: Simplify right side
   1,445.84x = 2,434,821.03
5. Step 5: Solve for x
   x = 2,434,821.03/1,445.84
6. Step 6: Final answer
   x = 1,684.02