Finding the Fourth Proportional to 2,219.67, 3,328.56 and 986.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.67 : 3,328.56 = 986.58 : x
2. Step 2: Convert to fraction form
   2,219.67/3,328.56 = 986.58/x
3. Step 3: Cross multiply
   2,219.67x = 3,328.56 × 986.58
4. Step 4: Simplify right side
   2,219.67x = 3,283,890.72
5. Step 5: Solve for x
   x = 3,283,890.72/2,219.67
6. Step 6: Final answer
   x = 1,479.45