Finding the Fourth Proportional to 9,997.10, 14,979.30 and 3,419.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.10 : 14,979.30 = 3,419.72 : x
2. Step 2: Convert to fraction form
   9,997.10/14,979.30 = 3,419.72/x
3. Step 3: Cross multiply
   9,997.10x = 14,979.30 × 3,419.72
4. Step 4: Simplify right side
   9,997.10x = 51,225,011.80
5. Step 5: Solve for x
   x = 51,225,011.80/9,997.10
6. Step 6: Final answer
   x = 5,123.99