Finding the Fourth Proportional to 1,776.69, 2,451.87 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.69 : 2,451.87 = 990.72 : x
2. Step 2: Convert to fraction form
   1,776.69/2,451.87 = 990.72/x
3. Step 3: Cross multiply
   1,776.69x = 2,451.87 × 990.72
4. Step 4: Simplify right side
   1,776.69x = 2,429,116.65
5. Step 5: Solve for x
   x = 2,429,116.65/1,776.69
6. Step 6: Final answer
   x = 1,367.21