Finding the Fourth Proportional to 2,724.10, 4,083.68 and 991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,724.10 : 4,083.68 = 991.50 : x
2. Step 2: Convert to fraction form
   2,724.10/4,083.68 = 991.50/x
3. Step 3: Cross multiply
   2,724.10x = 4,083.68 × 991.50
4. Step 4: Simplify right side
   2,724.10x = 4,048,968.72
5. Step 5: Solve for x
   x = 4,048,968.72/2,724.10
6. Step 6: Final answer
   x = 1,486.35