Finding the Fourth Proportional to 9,996.87, 14,978.89 and 3,419.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,996.87 : 14,978.89 = 3,419.47 : x
2. Step 2: Convert to fraction form
   9,996.87/14,978.89 = 3,419.47/x
3. Step 3: Cross multiply
   9,996.87x = 14,978.89 × 3,419.47
4. Step 4: Simplify right side
   9,996.87x = 51,219,864.99
5. Step 5: Solve for x
   x = 51,219,864.99/9,996.87
6. Step 6: Final answer
   x = 5,123.59