Finding the Fourth Proportional to 10,986.86, 16,480.32 and 5,147.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986.86 : 16,480.32 = 5,147.60 : x
2. Step 2: Convert to fraction form
   10,986.86/16,480.32 = 5,147.60/x
3. Step 3: Cross multiply
   10,986.86x = 16,480.32 × 5,147.60
4. Step 4: Simplify right side
   10,986.86x = 84,834,095.23
5. Step 5: Solve for x
   x = 84,834,095.23/10,986.86
6. Step 6: Final answer
   x = 7,721.41