Finding the Fourth Proportional to 10,920.42, 16,352.84 and 7,217.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.42 : 16,352.84 = 7,217.10 : x
2. Step 2: Convert to fraction form
   10,920.42/16,352.84 = 7,217.10/x
3. Step 3: Cross multiply
   10,920.42x = 16,352.84 × 7,217.10
4. Step 4: Simplify right side
   10,920.42x = 118,020,059.01
5. Step 5: Solve for x
   x = 118,020,059.01/10,920.42
6. Step 6: Final answer
   x = 10,807.28