Finding the Fourth Proportional to 1,615.82, 2,230.01 and 986.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.82 : 2,230.01 = 986.72 : x
2. Step 2: Convert to fraction form
   1,615.82/2,230.01 = 986.72/x
3. Step 3: Cross multiply
   1,615.82x = 2,230.01 × 986.72
4. Step 4: Simplify right side
   1,615.82x = 2,200,395.47
5. Step 5: Solve for x
   x = 2,200,395.47/1,615.82
6. Step 6: Final answer
   x = 1,361.78