Finding the Fourth Proportional to 2,219.46, 3,330.33 and 987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.46 : 3,330.33 = 987.72 : x
2. Step 2: Convert to fraction form
   2,219.46/3,330.33 = 987.72/x
3. Step 3: Cross multiply
   2,219.46x = 3,330.33 × 987.72
4. Step 4: Simplify right side
   2,219.46x = 3,289,433.55
5. Step 5: Solve for x
   x = 3,289,433.55/2,219.46
6. Step 6: Final answer
   x = 1,482.09