Finding the Fourth Proportional to 2,717.72, 4,077.18 and 986.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,717.72 : 4,077.18 = 986.30 : x
2. Step 2: Convert to fraction form
   2,717.72/4,077.18 = 986.30/x
3. Step 3: Cross multiply
   2,717.72x = 4,077.18 × 986.30
4. Step 4: Simplify right side
   2,717.72x = 4,021,322.63
5. Step 5: Solve for x
   x = 4,021,322.63/2,717.72
6. Step 6: Final answer
   x = 1,479.67