Finding the Fourth Proportional to 2,663.92, 3,997.76 and 999.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.92 : 3,997.76 = 999.47 : x
2. Step 2: Convert to fraction form
   2,663.92/3,997.76 = 999.47/x
3. Step 3: Cross multiply
   2,663.92x = 3,997.76 × 999.47
4. Step 4: Simplify right side
   2,663.92x = 3,995,646.18
5. Step 5: Solve for x
   x = 3,995,646.18/2,663.92
6. Step 6: Final answer
   x = 1,499.91