Finding the Fourth Proportional to 9,978.18, 14,969.61 and 3,404.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 14,969.61 = 3,404.39 : x
2. Step 2: Convert to fraction form
   9,978.18/14,969.61 = 3,404.39/x
3. Step 3: Cross multiply
   9,978.18x = 14,969.61 × 3,404.39
4. Step 4: Simplify right side
   9,978.18x = 50,962,315.74
5. Step 5: Solve for x
   x = 50,962,315.74/9,978.18
6. Step 6: Final answer
   x = 5,107.38