Finding the Fourth Proportional to 9,989.98, 14,983.54 and 3,415.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.98 : 14,983.54 = 3,415.20 : x
2. Step 2: Convert to fraction form
   9,989.98/14,983.54 = 3,415.20/x
3. Step 3: Cross multiply
   9,989.98x = 14,983.54 × 3,415.20
4. Step 4: Simplify right side
   9,989.98x = 51,171,785.81
5. Step 5: Solve for x
   x = 51,171,785.81/9,989.98
6. Step 6: Final answer
   x = 5,122.31