Finding the Fourth Proportional to 9,920.37, 14,880.78 and 3,997.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.37 : 14,880.78 = 3,997.86 : x
2. Step 2: Convert to fraction form
   9,920.37/14,880.78 = 3,997.86/x
3. Step 3: Cross multiply
   9,920.37x = 14,880.78 × 3,997.86
4. Step 4: Simplify right side
   9,920.37x = 59,491,275.13
5. Step 5: Solve for x
   x = 59,491,275.13/9,920.37
6. Step 6: Final answer
   x = 5,996.88