Finding the Fourth Proportional to 10,518.40, 14,615 and 10,408.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,518.40 : 14,615 = 10,408.72 : x
2. Step 2: Convert to fraction form
   10,518.40/14,615 = 10,408.72/x
3. Step 3: Cross multiply
   10,518.40x = 14,615 × 10,408.72
4. Step 4: Simplify right side
   10,518.40x = 152,123,442.80
5. Step 5: Solve for x
   x = 152,123,442.80/10,518.40
6. Step 6: Final answer
   x = 14,462.60