Finding the Fourth Proportional to 2,990.16, 4,485.42 and 910.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.16 : 4,485.42 = 910.31 : x
2. Step 2: Convert to fraction form
   2,990.16/4,485.42 = 910.31/x
3. Step 3: Cross multiply
   2,990.16x = 4,485.42 × 910.31
4. Step 4: Simplify right side
   2,990.16x = 4,083,100.25
5. Step 5: Solve for x
   x = 4,083,100.25/2,990.16
6. Step 6: Final answer
   x = 1,365.51