Finding the Fourth Proportional to 2,050.31, 3,075.86 and 663.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,050.31 : 3,075.86 = 663.99 : x
2. Step 2: Convert to fraction form
   2,050.31/3,075.86 = 663.99/x
3. Step 3: Cross multiply
   2,050.31x = 3,075.86 × 663.99
4. Step 4: Simplify right side
   2,050.31x = 2,042,321.58
5. Step 5: Solve for x
   x = 2,042,321.58/2,050.31
6. Step 6: Final answer
   x = 996.11