Finding the Fourth Proportional to 2,716.72, 4,075.68 and 985.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,716.72 : 4,075.68 = 985.30 : x
2. Step 2: Convert to fraction form
   2,716.72/4,075.68 = 985.30/x
3. Step 3: Cross multiply
   2,716.72x = 4,075.68 × 985.30
4. Step 4: Simplify right side
   2,716.72x = 4,015,767.50
5. Step 5: Solve for x
   x = 4,015,767.50/2,716.72
6. Step 6: Final answer
   x = 1,478.17