Finding the Fourth Proportional to 13,695.89, 18,900.31 and 7,408.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,695.89 : 18,900.31 = 7,408.26 : x
2. Step 2: Convert to fraction form
   13,695.89/18,900.31 = 7,408.26/x
3. Step 3: Cross multiply
   13,695.89x = 18,900.31 × 7,408.26
4. Step 4: Simplify right side
   13,695.89x = 140,018,410.56
5. Step 5: Solve for x
   x = 140,018,410.56/13,695.89
6. Step 6: Final answer
   x = 10,223.39