Finding the Fourth Proportional to 2,990.72, 4,485.57 and 910.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.72 : 4,485.57 = 910.22 : x
2. Step 2: Convert to fraction form
   2,990.72/4,485.57 = 910.22/x
3. Step 3: Cross multiply
   2,990.72x = 4,485.57 × 910.22
4. Step 4: Simplify right side
   2,990.72x = 4,082,833.10
5. Step 5: Solve for x
   x = 4,082,833.10/2,990.72
6. Step 6: Final answer
   x = 1,365.17