Finding the Fourth Proportional to 2,722.12, 4,083.82 and 990.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,722.12 : 4,083.82 = 990.76 : x
2. Step 2: Convert to fraction form
   2,722.12/4,083.82 = 990.76/x
3. Step 3: Cross multiply
   2,722.12x = 4,083.82 × 990.76
4. Step 4: Simplify right side
   2,722.12x = 4,046,085.50
5. Step 5: Solve for x
   x = 4,046,085.50/2,722.12
6. Step 6: Final answer
   x = 1,486.37