Finding the Fourth Proportional to 9,997.69, 14,980.12 and 3,420.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.69 : 14,980.12 = 3,420.29 : x
2. Step 2: Convert to fraction form
   9,997.69/14,980.12 = 3,420.29/x
3. Step 3: Cross multiply
   9,997.69x = 14,980.12 × 3,420.29
4. Step 4: Simplify right side
   9,997.69x = 51,236,271.18
5. Step 5: Solve for x
   x = 51,236,271.18/9,997.69
6. Step 6: Final answer
   x = 5,124.81