Finding the Fourth Proportional to 13,385.89, 18,472.67 and 7,417.65

Step by Step Solution

1. Step 1: Write the proportion equation
   13,385.89 : 18,472.67 = 7,417.65 : x
2. Step 2: Convert to fraction form
   13,385.89/18,472.67 = 7,417.65/x
3. Step 3: Cross multiply
   13,385.89x = 18,472.67 × 7,417.65
4. Step 4: Simplify right side
   13,385.89x = 137,023,800.63
5. Step 5: Solve for x
   x = 137,023,800.63/13,385.89
6. Step 6: Final answer
   x = 10,236.44