Finding the Fourth Proportional to 2,938.65, 4,407.89 and 990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.65 : 4,407.89 = 990.69 : x
2. Step 2: Convert to fraction form
   2,938.65/4,407.89 = 990.69/x
3. Step 3: Cross multiply
   2,938.65x = 4,407.89 × 990.69
4. Step 4: Simplify right side
   2,938.65x = 4,366,847.59
5. Step 5: Solve for x
   x = 4,366,847.59/2,938.65
6. Step 6: Final answer
   x = 1,486.00