Finding the Fourth Proportional to 13,386.07, 18,472.56 and 7,417.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,386.07 : 18,472.56 = 7,417.72 : x
2. Step 2: Convert to fraction form
   13,386.07/18,472.56 = 7,417.72/x
3. Step 3: Cross multiply
   13,386.07x = 18,472.56 × 7,417.72
4. Step 4: Simplify right side
   13,386.07x = 137,024,277.76
5. Step 5: Solve for x
   x = 137,024,277.76/13,386.07
6. Step 6: Final answer
   x = 10,236.33