Finding the Fourth Proportional to 2,990.66, 4,484.17 and 1,139.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.66 : 4,484.17 = 1,139.81 : x
2. Step 2: Convert to fraction form
   2,990.66/4,484.17 = 1,139.81/x
3. Step 3: Cross multiply
   2,990.66x = 4,484.17 × 1,139.81
4. Step 4: Simplify right side
   2,990.66x = 5,111,073.69
5. Step 5: Solve for x
   x = 5,111,073.69/2,990.66
6. Step 6: Final answer
   x = 1,709.01