Finding the Fourth Proportional to 9,996.10, 14,977.80 and 3,418.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,996.10 : 14,977.80 = 3,418.72 : x
2. Step 2: Convert to fraction form
   9,996.10/14,977.80 = 3,418.72/x
3. Step 3: Cross multiply
   9,996.10x = 14,977.80 × 3,418.72
4. Step 4: Simplify right side
   9,996.10x = 51,204,904.42
5. Step 5: Solve for x
   x = 51,204,904.42/9,996.10
6. Step 6: Final answer
   x = 5,122.49