Finding the Fourth Proportional to 2,990.50, 4,486.83 and 938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.50 : 4,486.83 = 938.50 : x
2. Step 2: Convert to fraction form
   2,990.50/4,486.83 = 938.50/x
3. Step 3: Cross multiply
   2,990.50x = 4,486.83 × 938.50
4. Step 4: Simplify right side
   2,990.50x = 4,210,889.96
5. Step 5: Solve for x
   x = 4,210,889.96/2,990.50
6. Step 6: Final answer
   x = 1,408.09