Finding the Fourth Proportional to 10,916.04, 16,359.42 and 10,216.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,916.04 : 16,359.42 = 10,216.20 : x
2. Step 2: Convert to fraction form
   10,916.04/16,359.42 = 10,216.20/x
3. Step 3: Cross multiply
   10,916.04x = 16,359.42 × 10,216.20
4. Step 4: Simplify right side
   10,916.04x = 167,131,106.60
5. Step 5: Solve for x
   x = 167,131,106.60/10,916.04
6. Step 6: Final answer
   x = 15,310.60