Finding the Fourth Proportional to 2,940.15, 4,407.49 and 990.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.15 : 4,407.49 = 990.98 : x
2. Step 2: Convert to fraction form
   2,940.15/4,407.49 = 990.98/x
3. Step 3: Cross multiply
   2,940.15x = 4,407.49 × 990.98
4. Step 4: Simplify right side
   2,940.15x = 4,367,752.17
5. Step 5: Solve for x
   x = 4,367,752.17/2,940.15
6. Step 6: Final answer
   x = 1,485.56