Finding the Fourth Proportional to 13,456.38, 18,570.53 and 7,487.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.38 : 18,570.53 = 7,487.91 : x
2. Step 2: Convert to fraction form
   13,456.38/18,570.53 = 7,487.91/x
3. Step 3: Cross multiply
   13,456.38x = 18,570.53 × 7,487.91
4. Step 4: Simplify right side
   13,456.38x = 139,054,476.01
5. Step 5: Solve for x
   x = 139,054,476.01/13,456.38
6. Step 6: Final answer
   x = 10,333.72