Finding the Fourth Proportional to 10,816.32, 16,229.52 and 10,641.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,816.32 : 16,229.52 = 10,641.60 : x
2. Step 2: Convert to fraction form
   10,816.32/16,229.52 = 10,641.60/x
3. Step 3: Cross multiply
   10,816.32x = 16,229.52 × 10,641.60
4. Step 4: Simplify right side
   10,816.32x = 172,708,060.03
5. Step 5: Solve for x
   x = 172,708,060.03/10,816.32
6. Step 6: Final answer
   x = 15,967.36