Finding the Fourth Proportional to 9,983.39, 14,978.12 and 3,409.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,983.39 : 14,978.12 = 3,409.56 : x
2. Step 2: Convert to fraction form
   9,983.39/14,978.12 = 3,409.56/x
3. Step 3: Cross multiply
   9,983.39x = 14,978.12 × 3,409.56
4. Step 4: Simplify right side
   9,983.39x = 51,068,781.78
5. Step 5: Solve for x
   x = 51,068,781.78/9,983.39
6. Step 6: Final answer
   x = 5,115.38