Finding the Fourth Proportional to 2,633.19, 3,947.35 and 990.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,633.19 : 3,947.35 = 990.83 : x
2. Step 2: Convert to fraction form
   2,633.19/3,947.35 = 990.83/x
3. Step 3: Cross multiply
   2,633.19x = 3,947.35 × 990.83
4. Step 4: Simplify right side
   2,633.19x = 3,911,140.46
5. Step 5: Solve for x
   x = 3,911,140.46/2,633.19
6. Step 6: Final answer
   x = 1,485.32