Finding the Fourth Proportional to 10,401.98, 15,603.03 and 3,990.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,401.98 : 15,603.03 = 3,990.42 : x
2. Step 2: Convert to fraction form
   10,401.98/15,603.03 = 3,990.42/x
3. Step 3: Cross multiply
   10,401.98x = 15,603.03 × 3,990.42
4. Step 4: Simplify right side
   10,401.98x = 62,262,642.97
5. Step 5: Solve for x
   x = 62,262,642.97/10,401.98
6. Step 6: Final answer
   x = 5,985.66