Finding the Fourth Proportional to 9,983.69, 14,978.27 and 4,140.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,983.69 : 14,978.27 = 4,140.30 : x
2. Step 2: Convert to fraction form
   9,983.69/14,978.27 = 4,140.30/x
3. Step 3: Cross multiply
   9,983.69x = 14,978.27 × 4,140.30
4. Step 4: Simplify right side
   9,983.69x = 62,014,531.28
5. Step 5: Solve for x
   x = 62,014,531.28/9,983.69
6. Step 6: Final answer
   x = 6,211.58