Finding the Fourth Proportional to 1,786.83, 2,465.81 and 990.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,786.83 : 2,465.81 = 990.21 : x
2. Step 2: Convert to fraction form
   1,786.83/2,465.81 = 990.21/x
3. Step 3: Cross multiply
   1,786.83x = 2,465.81 × 990.21
4. Step 4: Simplify right side
   1,786.83x = 2,441,669.72
5. Step 5: Solve for x
   x = 2,441,669.72/1,786.83
6. Step 6: Final answer
   x = 1,366.48