Finding the Fourth Proportional to 10,659.98, 15,989.98 and 3,998

Step by Step Solution

1. Step 1: Write the proportion equation
   10,659.98 : 15,989.98 = 3,998 : x
2. Step 2: Convert to fraction form
   10,659.98/15,989.98 = 3,998/x
3. Step 3: Cross multiply
   10,659.98x = 15,989.98 × 3,998
4. Step 4: Simplify right side
   10,659.98x = 63,927,940.04
5. Step 5: Solve for x
   x = 63,927,940.04/10,659.98
6. Step 6: Final answer
   x = 5,997.00