Finding the Fourth Proportional to 2,990.28, 4,484.73 and 1,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.28 : 4,484.73 = 1,140.72 : x
2. Step 2: Convert to fraction form
   2,990.28/4,484.73 = 1,140.72/x
3. Step 3: Cross multiply
   2,990.28x = 4,484.73 × 1,140.72
4. Step 4: Simplify right side
   2,990.28x = 5,115,821.21
5. Step 5: Solve for x
   x = 5,115,821.21/2,990.28
6. Step 6: Final answer
   x = 1,710.82