Finding the Fourth Proportional to 1,776.72, 2,451.81 and 990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.72 : 2,451.81 = 990.75 : x
2. Step 2: Convert to fraction form
   1,776.72/2,451.81 = 990.75/x
3. Step 3: Cross multiply
   1,776.72x = 2,451.81 × 990.75
4. Step 4: Simplify right side
   1,776.72x = 2,429,130.76
5. Step 5: Solve for x
   x = 2,429,130.76/1,776.72
6. Step 6: Final answer
   x = 1,367.20