Finding the Fourth Proportional to 1,776.28, 2,451.33 and 990.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.28 : 2,451.33 = 990.37 : x
2. Step 2: Convert to fraction form
   1,776.28/2,451.33 = 990.37/x
3. Step 3: Cross multiply
   1,776.28x = 2,451.33 × 990.37
4. Step 4: Simplify right side
   1,776.28x = 2,427,723.69
5. Step 5: Solve for x
   x = 2,427,723.69/1,776.28
6. Step 6: Final answer
   x = 1,366.75