Finding the Fourth Proportional to 13,385.60, 18,472.32 and 7,417.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,385.60 : 18,472.32 = 7,417.28 : x
2. Step 2: Convert to fraction form
   13,385.60/18,472.32 = 7,417.28/x
3. Step 3: Cross multiply
   13,385.60x = 18,472.32 × 7,417.28
4. Step 4: Simplify right side
   13,385.60x = 137,014,369.69
5. Step 5: Solve for x
   x = 137,014,369.69/13,385.60
6. Step 6: Final answer
   x = 10,235.95