Finding the Fourth Proportional to 2,663.55, 3,997.20 and 999.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.55 : 3,997.20 = 999.11 : x
2. Step 2: Convert to fraction form
   2,663.55/3,997.20 = 999.11/x
3. Step 3: Cross multiply
   2,663.55x = 3,997.20 × 999.11
4. Step 4: Simplify right side
   2,663.55x = 3,993,622.51
5. Step 5: Solve for x
   x = 3,993,622.51/2,663.55
6. Step 6: Final answer
   x = 1,499.36