Finding the Fourth Proportional to 12,434.21, 18,651.31 and 4,111.99

Step by Step Solution

1. Step 1: Write the proportion equation
   12,434.21 : 18,651.31 = 4,111.99 : x
2. Step 2: Convert to fraction form
   12,434.21/18,651.31 = 4,111.99/x
3. Step 3: Cross multiply
   12,434.21x = 18,651.31 × 4,111.99
4. Step 4: Simplify right side
   12,434.21x = 76,694,018.89
5. Step 5: Solve for x
   x = 76,694,018.89/12,434.21
6. Step 6: Final answer
   x = 6,167.99